diff --git a/src/libraries/Microsoft.Win32.Registry/src/Microsoft.Win32.Registry.csproj b/src/libraries/Microsoft.Win32.Registry/src/Microsoft.Win32.Registry.csproj
index 7cb3100170e1b..dafbc2ed8e9eb 100644
--- a/src/libraries/Microsoft.Win32.Registry/src/Microsoft.Win32.Registry.csproj
+++ b/src/libraries/Microsoft.Win32.Registry/src/Microsoft.Win32.Registry.csproj
@@ -66,7 +66,6 @@
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deleted file mode 100644
index 63f02a0f817ef..0000000000000
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diff --git a/src/libraries/System.Buffers/ref/System.Buffers.Forwards.cs b/src/libraries/System.Buffers/ref/System.Buffers.Forwards.cs
deleted file mode 100644
index 9dce485932472..0000000000000
--- a/src/libraries/System.Buffers/ref/System.Buffers.Forwards.cs
+++ /dev/null
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diff --git a/src/libraries/System.Globalization/ref/System.Globalization.csproj b/src/libraries/System.Globalization/ref/System.Globalization.csproj
deleted file mode 100644
index ac9a0d3f3945b..0000000000000
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-This assembly no longer contains any code.  It is provided only to permit type unification for libraries built against previous versions of .NET.
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deleted file mode 100644
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-## Source
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diff --git a/src/libraries/System.Threading.Tasks/README.md b/src/libraries/System.Threading.Tasks/README.md
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-# System.Threading.Tasks
-Provides types that simplify the work of writing concurrent and asynchronous code. The main types are [`Task`](https://learn.microsoft.com/dotnet/api/system.threading.tasks.task) which represents an asynchronous operation that can be waited on and cancelled, and [`Task<TResult>`](https://learn.microsoft.com/dotnet/api/system.threading.tasks.task-1), which is a task that can return a value. The [`TaskFactory`](https://learn.microsoft.com/dotnet/api/system.threading.tasks.taskfactory) class provides static methods for creating and starting tasks, and the [`TaskScheduler`](https://learn.microsoft.com/dotnet/api/system.threading.tasks.taskscheduler) class provides the default thread scheduling infrastructure.
-
-Documentation can be found at https://learn.microsoft.com/dotnet/api/system.threading.tasks
-
-## Contribution Bar
-- [x] [We consider new features, new APIs and performance changes](../../libraries/README.md#primary-bar)
-- [x] [We consider PRs that target this library for new source code analyzers](../../libraries/README.md#secondary-bars)
-
-See the [Help Wanted](https://github.com/dotnet/runtime/issues?q=is%3Aissue+is%3Aopen+label%3A%22help+wanted%22+label%3Aarea-System.Threading.Tasks) issues.
-
-## Source
-
-* The source of this project can found in [../System.Private.CoreLib/src/System/Threading/Tasks](../System.Private.CoreLib/src/System/Threading/Tasks)
-
-## Deployment
-[System.Threading.Tasks](https://www.nuget.org/packages/System.Threading.Tasks) is included in the shared framework. The package does not need to be installed into any project compatible with .NET Standard 2.0.
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index 8e784c9864ff8..0000000000000
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deleted file mode 100644
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deleted file mode 100644
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+++ /dev/null
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diff --git a/src/libraries/System.Xml.XmlDocument/README.md b/src/libraries/System.Xml.XmlDocument/README.md
deleted file mode 100644
index 694817c769293..0000000000000
--- a/src/libraries/System.Xml.XmlDocument/README.md
+++ /dev/null
@@ -1,10 +0,0 @@
-# System.Xml.XMLDocument
-This assembly surfaces [`XMLDocument`](https://learn.microsoft.com/dotnet/api/system.xml.xmldocument) and related types. See the [`System.Private.Xml` README file](../System.Private.Xml/README.md) for an overview of the XML-processing libraries the framework provides.
-
-Documentation can be found at https://learn.microsoft.com/dotnet/standard/serialization/introducing-xml-serialization.
-
-## Contribution Bar
-- [x] [We only consider lower-risk or high-impact fixes to maintain or improve quality](../../libraries/README.md#primary-bar)
-
-## Deployment
-The `System.Xml.XMLDocument` library is included in the shared framework and also shipped as a [NuGet package](https://www.nuget.org/packages/System.Xml.XMLDocument). The NuGet package is considered "legacy" and should not be referenced by projects compatible with .NET Standard 2.0.
\ No newline at end of file
diff --git a/src/libraries/System.Xml.XmlDocument/System.Xml.XmlDocument.sln b/src/libraries/System.Xml.XmlDocument/System.Xml.XmlDocument.sln
deleted file mode 100644
index 667c5d3aadcab..0000000000000
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+++ /dev/null
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diff --git a/src/libraries/System.Xml.XmlDocument/ref/System.Xml.XmlDocument.cs b/src/libraries/System.Xml.XmlDocument/ref/System.Xml.XmlDocument.cs
deleted file mode 100644
index a8addedb1f263..0000000000000
--- a/src/libraries/System.Xml.XmlDocument/ref/System.Xml.XmlDocument.cs
+++ /dev/null
@@ -1,5 +0,0 @@
-// Licensed to the .NET Foundation under one or more agreements.
-// The .NET Foundation licenses this file to you under the MIT license.
-// ------------------------------------------------------------------------------
-// Changes to this file must follow the https://aka.ms/api-review process.
-// ------------------------------------------------------------------------------
diff --git a/src/libraries/System.Xml.XmlDocument/ref/System.Xml.XmlDocument.csproj b/src/libraries/System.Xml.XmlDocument/ref/System.Xml.XmlDocument.csproj
deleted file mode 100644
index b0f234556b7cb..0000000000000
--- a/src/libraries/System.Xml.XmlDocument/ref/System.Xml.XmlDocument.csproj
+++ /dev/null
@@ -1,13 +0,0 @@
-<Project Sdk="Microsoft.NET.Sdk">
-  <PropertyGroup>
-    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
-  </PropertyGroup>
-  <ItemGroup>
-    <Compile Include="System.Xml.XmlDocument.cs" />
-    <Compile Include="System.Xml.XmlDocument.Forwards.cs" />
-  </ItemGroup>
-  <ItemGroup>
-    <ProjectReference Include="..\..\System.Runtime\ref\System.Runtime.csproj" />
-    <ProjectReference Include="..\..\System.Xml.ReaderWriter\ref\System.Xml.ReaderWriter.csproj" />
-  </ItemGroup>
-</Project>
\ No newline at end of file
diff --git a/src/libraries/System.Xml.XmlDocument/src/System.Xml.XmlDocument.csproj b/src/libraries/System.Xml.XmlDocument/src/System.Xml.XmlDocument.csproj
deleted file mode 100644
index e9f092e47c363..0000000000000
--- a/src/libraries/System.Xml.XmlDocument/src/System.Xml.XmlDocument.csproj
+++ /dev/null
@@ -1,14 +0,0 @@
-<Project Sdk="Microsoft.NET.Sdk">
-
-  <PropertyGroup>
-    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
-    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
-    <IsPartialFacadeAssembly>true</IsPartialFacadeAssembly>
-  </PropertyGroup>
-
-  <ItemGroup>
-    <ProjectReference Include="$(LibrariesProjectRoot)System.Private.Xml\src\System.Private.Xml.csproj" PrivateAssets="all" />
-    <Reference Include="System.Runtime" />
-  </ItemGroup>
-
-</Project>
\ No newline at end of file
diff --git a/src/libraries/shims/Directory.Build.props b/src/libraries/shims/Directory.Build.props
index 58fda46f5359b..a325502afbf5f 100644
--- a/src/libraries/shims/Directory.Build.props
+++ b/src/libraries/shims/Directory.Build.props
@@ -17,6 +17,7 @@
     <ILLinkTrimAssembly>false</ILLinkTrimAssembly>
     <AddOSPlatformAttributes>false</AddOSPlatformAttributes>
     <GenerateDocumentationFile>false</GenerateDocumentationFile>
+    <SkipLocalsInit>false</SkipLocalsInit>
     <!-- Allow shim ref projects to reference source projects which is required for referencing shared
         framework dependencies. -->
     <SkipValidateReferenceAssemblyProjectReferences Condition="'$(IsReferenceAssemblyProject)' == 'true'">true</SkipValidateReferenceAssemblyProjectReferences>
diff --git a/src/libraries/shims/README.md b/src/libraries/shims/README.md
index 6fe99a506261f..12f5c898db611 100644
--- a/src/libraries/shims/README.md
+++ b/src/libraries/shims/README.md
@@ -5,5 +5,6 @@ The projects under this directory are pure facade assemblies (also called shims)
 Currently, the following types of facades are checked-in:
 - .NET Framework facade assemblies (i.e. mscorlib.dll) which enable loading .NET Framework compiled assemblies into a .NETCoreApp environment.
 - .NET Standard facade assembly (netstandard.dll) which enables loading .NET Standard compiled assemblies into a .NETCoreApp environment.
+- .NET facade assemblies (i.e. System.AppContext.dll) which enable loading assemblies compiled against a previous version of the .NETCoreApp shared framework.
 
-Some facade folders contain reference source projects ("ref") in addition to source projects ("src"). Those might exist because of the source project referencing internal types. If only a source project exists, the compiled assembly will be included in both the targeting and the runtime pack.
\ No newline at end of file
+Some facade folders contain reference source projects ("ref") in addition to source projects ("src"). Those might exist because of the source project referencing internal types or type forwarding to a different destination assembly. If only a source project exists, the compiled assembly will be included in both the targeting and the runtime pack.
\ No newline at end of file
diff --git a/src/libraries/shims/System.AppContext/src/System.AppContext.cs b/src/libraries/shims/System.AppContext/src/System.AppContext.cs
new file mode 100644
index 0000000000000..bbab28a7f5052
--- /dev/null
+++ b/src/libraries/shims/System.AppContext/src/System.AppContext.cs
@@ -0,0 +1,4 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+[assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.AppContext))]
diff --git a/src/libraries/shims/System.AppContext/src/System.AppContext.csproj b/src/libraries/shims/System.AppContext/src/System.AppContext.csproj
new file mode 100644
index 0000000000000..a7c7ac74a32b8
--- /dev/null
+++ b/src/libraries/shims/System.AppContext/src/System.AppContext.csproj
@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <StrongNameKeyId>Microsoft</StrongNameKeyId>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime\src\System.Runtime.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/libraries/shims/System.Buffers/src/System.Buffers.cs b/src/libraries/shims/System.Buffers/src/System.Buffers.cs
new file mode 100644
index 0000000000000..e4d3bc4ce1ea8
--- /dev/null
+++ b/src/libraries/shims/System.Buffers/src/System.Buffers.cs
@@ -0,0 +1,4 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+[assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Buffers.ArrayPool<>))]
diff --git a/src/libraries/shims/System.Buffers/src/System.Buffers.csproj b/src/libraries/shims/System.Buffers/src/System.Buffers.csproj
new file mode 100644
index 0000000000000..dd2453032f204
--- /dev/null
+++ b/src/libraries/shims/System.Buffers/src/System.Buffers.csproj
@@ -0,0 +1,7 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <ItemGroup>
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime\src\System.Runtime.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/libraries/System.Data.DataSetExtensions/ref/System.Data.DataSetExtensions.Forwards.cs b/src/libraries/shims/System.Data.DataSetExtensions/src/System.Data.DataSetExtensions.cs
similarity index 100%
rename from src/libraries/System.Data.DataSetExtensions/ref/System.Data.DataSetExtensions.Forwards.cs
rename to src/libraries/shims/System.Data.DataSetExtensions/src/System.Data.DataSetExtensions.cs
diff --git a/src/libraries/shims/System.Data.DataSetExtensions/src/System.Data.DataSetExtensions.csproj b/src/libraries/shims/System.Data.DataSetExtensions/src/System.Data.DataSetExtensions.csproj
new file mode 100644
index 0000000000000..53b0a7a3e5d8f
--- /dev/null
+++ b/src/libraries/shims/System.Data.DataSetExtensions/src/System.Data.DataSetExtensions.csproj
@@ -0,0 +1,12 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <StrongNameKeyId>ECMA</StrongNameKeyId>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime\src\System.Runtime.csproj" />
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Data.Common\src\System.Data.Common.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/libraries/System.Diagnostics.Debug/ref/System.Diagnostics.Debug.Forwards.cs b/src/libraries/shims/System.Diagnostics.Debug/src/System.Diagnostics.Debug.cs
similarity index 85%
rename from src/libraries/System.Diagnostics.Debug/ref/System.Diagnostics.Debug.Forwards.cs
rename to src/libraries/shims/System.Diagnostics.Debug/src/System.Diagnostics.Debug.cs
index cb1be3e08db88..ea343dd2152ce 100644
--- a/src/libraries/System.Diagnostics.Debug/ref/System.Diagnostics.Debug.Forwards.cs
+++ b/src/libraries/shims/System.Diagnostics.Debug/src/System.Diagnostics.Debug.cs
@@ -1,8 +1,5 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
-// ------------------------------------------------------------------------------
-// Changes to this file must follow the https://aka.ms/api-review process.
-// ------------------------------------------------------------------------------
 
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Diagnostics.Debug))]
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Diagnostics.Debugger))]
diff --git a/src/libraries/shims/System.Diagnostics.Debug/src/System.Diagnostics.Debug.csproj b/src/libraries/shims/System.Diagnostics.Debug/src/System.Diagnostics.Debug.csproj
new file mode 100644
index 0000000000000..a7c7ac74a32b8
--- /dev/null
+++ b/src/libraries/shims/System.Diagnostics.Debug/src/System.Diagnostics.Debug.csproj
@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <StrongNameKeyId>Microsoft</StrongNameKeyId>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime\src\System.Runtime.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/libraries/System.Diagnostics.Tools/ref/System.Diagnostics.Tools.Forwards.cs b/src/libraries/shims/System.Diagnostics.Tools/src/System.Diagnostics.Tools.cs
similarity index 68%
rename from src/libraries/System.Diagnostics.Tools/ref/System.Diagnostics.Tools.Forwards.cs
rename to src/libraries/shims/System.Diagnostics.Tools/src/System.Diagnostics.Tools.cs
index 2e05aae1129d2..f64054bbbe62f 100644
--- a/src/libraries/System.Diagnostics.Tools/ref/System.Diagnostics.Tools.Forwards.cs
+++ b/src/libraries/shims/System.Diagnostics.Tools/src/System.Diagnostics.Tools.cs
@@ -1,8 +1,5 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
-// ------------------------------------------------------------------------------
-// Changes to this file must follow the https://aka.ms/api-review process.
-// ------------------------------------------------------------------------------
 
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.CodeDom.Compiler.GeneratedCodeAttribute))]
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverageAttribute))]
diff --git a/src/libraries/shims/System.Diagnostics.Tools/src/System.Diagnostics.Tools.csproj b/src/libraries/shims/System.Diagnostics.Tools/src/System.Diagnostics.Tools.csproj
new file mode 100644
index 0000000000000..a7c7ac74a32b8
--- /dev/null
+++ b/src/libraries/shims/System.Diagnostics.Tools/src/System.Diagnostics.Tools.csproj
@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <StrongNameKeyId>Microsoft</StrongNameKeyId>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime\src\System.Runtime.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/libraries/System.Dynamic.Runtime/ref/System.Dynamic.Runtime.Forwards.cs b/src/libraries/shims/System.Dynamic.Runtime/src/System.Dynamic.Runtime.cs
similarity index 92%
rename from src/libraries/System.Dynamic.Runtime/ref/System.Dynamic.Runtime.Forwards.cs
rename to src/libraries/shims/System.Dynamic.Runtime/src/System.Dynamic.Runtime.cs
index 3e6b498b87f77..9dc8475111cd6 100644
--- a/src/libraries/System.Dynamic.Runtime/ref/System.Dynamic.Runtime.Forwards.cs
+++ b/src/libraries/shims/System.Dynamic.Runtime/src/System.Dynamic.Runtime.cs
@@ -1,8 +1,5 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
-// ------------------------------------------------------------------------------
-// Changes to this file must follow the https://aka.ms/api-review process.
-// ------------------------------------------------------------------------------
 
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Runtime.CompilerServices.CallSiteBinder))]
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Runtime.CompilerServices.CallSite))]
diff --git a/src/libraries/shims/System.Dynamic.Runtime/src/System.Dynamic.Runtime.csproj b/src/libraries/shims/System.Dynamic.Runtime/src/System.Dynamic.Runtime.csproj
new file mode 100644
index 0000000000000..cda699f53f755
--- /dev/null
+++ b/src/libraries/shims/System.Dynamic.Runtime/src/System.Dynamic.Runtime.csproj
@@ -0,0 +1,12 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <StrongNameKeyId>Microsoft</StrongNameKeyId>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime\src\System.Runtime.csproj" />
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Linq.Expressions\src\System.Linq.Expressions.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/libraries/System.Globalization.Calendars/ref/System.Globalization.Calendars.Forwards.cs b/src/libraries/shims/System.Globalization.Calendars/src/System.Globalization.Calendars.cs
similarity index 88%
rename from src/libraries/System.Globalization.Calendars/ref/System.Globalization.Calendars.Forwards.cs
rename to src/libraries/shims/System.Globalization.Calendars/src/System.Globalization.Calendars.cs
index 5c77e6de29793..4fde14cd6c831 100644
--- a/src/libraries/System.Globalization.Calendars/ref/System.Globalization.Calendars.Forwards.cs
+++ b/src/libraries/shims/System.Globalization.Calendars/src/System.Globalization.Calendars.cs
@@ -1,8 +1,5 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
-// ------------------------------------------------------------------------------
-// Changes to this file must follow the https://aka.ms/api-review process.
-// ------------------------------------------------------------------------------
 
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Globalization.ChineseLunisolarCalendar))]
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Globalization.EastAsianLunisolarCalendar))]
diff --git a/src/libraries/shims/System.Globalization.Calendars/src/System.Globalization.Calendars.csproj b/src/libraries/shims/System.Globalization.Calendars/src/System.Globalization.Calendars.csproj
new file mode 100644
index 0000000000000..a7c7ac74a32b8
--- /dev/null
+++ b/src/libraries/shims/System.Globalization.Calendars/src/System.Globalization.Calendars.csproj
@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <StrongNameKeyId>Microsoft</StrongNameKeyId>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime\src\System.Runtime.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/libraries/System.Globalization.Extensions/ref/System.Globalization.Extensions.Forwards.cs b/src/libraries/shims/System.Globalization.Extensions/src/System.Globalization.Extensions.cs
similarity index 100%
rename from src/libraries/System.Globalization.Extensions/ref/System.Globalization.Extensions.Forwards.cs
rename to src/libraries/shims/System.Globalization.Extensions/src/System.Globalization.Extensions.cs
diff --git a/src/libraries/shims/System.Globalization.Extensions/src/System.Globalization.Extensions.csproj b/src/libraries/shims/System.Globalization.Extensions/src/System.Globalization.Extensions.csproj
new file mode 100644
index 0000000000000..a7c7ac74a32b8
--- /dev/null
+++ b/src/libraries/shims/System.Globalization.Extensions/src/System.Globalization.Extensions.csproj
@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <StrongNameKeyId>Microsoft</StrongNameKeyId>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime\src\System.Runtime.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/libraries/System.Globalization/ref/System.Globalization.Forwards.cs b/src/libraries/shims/System.Globalization/src/System.Globalization.cs
similarity index 100%
rename from src/libraries/System.Globalization/ref/System.Globalization.Forwards.cs
rename to src/libraries/shims/System.Globalization/src/System.Globalization.cs
diff --git a/src/libraries/shims/System.Globalization/src/System.Globalization.csproj b/src/libraries/shims/System.Globalization/src/System.Globalization.csproj
new file mode 100644
index 0000000000000..a7c7ac74a32b8
--- /dev/null
+++ b/src/libraries/shims/System.Globalization/src/System.Globalization.csproj
@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <StrongNameKeyId>Microsoft</StrongNameKeyId>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime\src\System.Runtime.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/libraries/System.IO.FileSystem.Primitives/ref/System.IO.FileSystem.Primitives.Forwards.cs b/src/libraries/shims/System.IO.FileSystem.Primitives/src/System.IO.FileSystem.Primitives.cs
similarity index 71%
rename from src/libraries/System.IO.FileSystem.Primitives/ref/System.IO.FileSystem.Primitives.Forwards.cs
rename to src/libraries/shims/System.IO.FileSystem.Primitives/src/System.IO.FileSystem.Primitives.cs
index 7c52d8c955e75..b5a6a49d09828 100644
--- a/src/libraries/System.IO.FileSystem.Primitives/ref/System.IO.FileSystem.Primitives.Forwards.cs
+++ b/src/libraries/shims/System.IO.FileSystem.Primitives/src/System.IO.FileSystem.Primitives.cs
@@ -1,8 +1,5 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
-// ------------------------------------------------------------------------------
-// Changes to this file must follow the https://aka.ms/api-review process.
-// ------------------------------------------------------------------------------
 
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(Microsoft.Win32.SafeHandles.SafeFileHandle))]
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.IO.FileAccess))]
diff --git a/src/libraries/shims/System.IO.FileSystem.Primitives/src/System.IO.FileSystem.Primitives.csproj b/src/libraries/shims/System.IO.FileSystem.Primitives/src/System.IO.FileSystem.Primitives.csproj
new file mode 100644
index 0000000000000..a7c7ac74a32b8
--- /dev/null
+++ b/src/libraries/shims/System.IO.FileSystem.Primitives/src/System.IO.FileSystem.Primitives.csproj
@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <StrongNameKeyId>Microsoft</StrongNameKeyId>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime\src\System.Runtime.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/libraries/System.IO.FileSystem/ref/System.IO.FileSystem.Forwards.cs b/src/libraries/shims/System.IO.FileSystem/src/System.IO.FileSystem.cs
similarity index 87%
rename from src/libraries/System.IO.FileSystem/ref/System.IO.FileSystem.Forwards.cs
rename to src/libraries/shims/System.IO.FileSystem/src/System.IO.FileSystem.cs
index f2ea51b0ddb0d..394b741fd4bc8 100644
--- a/src/libraries/System.IO.FileSystem/ref/System.IO.FileSystem.Forwards.cs
+++ b/src/libraries/shims/System.IO.FileSystem/src/System.IO.FileSystem.cs
@@ -1,8 +1,5 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
-// ------------------------------------------------------------------------------
-// Changes to this file must follow the https://aka.ms/api-review process.
-// ------------------------------------------------------------------------------
 
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(Microsoft.Win32.SafeHandles.SafeFileHandle))]
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.IO.FileOptions))]
@@ -20,4 +17,3 @@
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.IO.Enumeration.FileSystemEnumerable<>))]
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.IO.Enumeration.FileSystemEnumerator<>))]
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.IO.Enumeration.FileSystemName))]
-
diff --git a/src/libraries/shims/System.IO.FileSystem/src/System.IO.FileSystem.csproj b/src/libraries/shims/System.IO.FileSystem/src/System.IO.FileSystem.csproj
new file mode 100644
index 0000000000000..a7c7ac74a32b8
--- /dev/null
+++ b/src/libraries/shims/System.IO.FileSystem/src/System.IO.FileSystem.csproj
@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <StrongNameKeyId>Microsoft</StrongNameKeyId>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime\src\System.Runtime.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/libraries/System.IO.UnmanagedMemoryStream/ref/System.IO.UnmanagedMemoryStream.Forwards.cs b/src/libraries/shims/System.IO.UnmanagedMemoryStream/src/System.IO.UnmanagedMemoryStream.cs
similarity index 58%
rename from src/libraries/System.IO.UnmanagedMemoryStream/ref/System.IO.UnmanagedMemoryStream.Forwards.cs
rename to src/libraries/shims/System.IO.UnmanagedMemoryStream/src/System.IO.UnmanagedMemoryStream.cs
index 855f120b9a676..965e68161e086 100644
--- a/src/libraries/System.IO.UnmanagedMemoryStream/ref/System.IO.UnmanagedMemoryStream.Forwards.cs
+++ b/src/libraries/shims/System.IO.UnmanagedMemoryStream/src/System.IO.UnmanagedMemoryStream.cs
@@ -1,8 +1,5 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
-// ------------------------------------------------------------------------------
-// Changes to this file must follow the https://aka.ms/api-review process.
-// ------------------------------------------------------------------------------
 
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.IO.UnmanagedMemoryStream))]
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.IO.UnmanagedMemoryAccessor))]
diff --git a/src/libraries/shims/System.IO.UnmanagedMemoryStream/src/System.IO.UnmanagedMemoryStream.csproj b/src/libraries/shims/System.IO.UnmanagedMemoryStream/src/System.IO.UnmanagedMemoryStream.csproj
new file mode 100644
index 0000000000000..72b7e577322d9
--- /dev/null
+++ b/src/libraries/shims/System.IO.UnmanagedMemoryStream/src/System.IO.UnmanagedMemoryStream.csproj
@@ -0,0 +1,12 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <StrongNameKeyId>Microsoft</StrongNameKeyId>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime.InteropServices\src\System.Runtime.InteropServices.csproj" />
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime\src\System.Runtime.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/libraries/System.IO/ref/System.IO.Forwards.cs b/src/libraries/shims/System.IO/src/System.IO.cs
similarity index 86%
rename from src/libraries/System.IO/ref/System.IO.Forwards.cs
rename to src/libraries/shims/System.IO/src/System.IO.cs
index bc847be23adc8..f9386585c6c3c 100644
--- a/src/libraries/System.IO/ref/System.IO.Forwards.cs
+++ b/src/libraries/shims/System.IO/src/System.IO.cs
@@ -1,11 +1,6 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
-// ------------------------------------------------------------------------------
-// Changes to this file must follow the https://aka.ms/api-review process.
-// ------------------------------------------------------------------------------
 
-
-// Types moved down into System.Runtime
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.IO.FileNotFoundException))]
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.IO.IOException))]
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.IO.SeekOrigin))]
diff --git a/src/libraries/shims/System.IO/src/System.IO.csproj b/src/libraries/shims/System.IO/src/System.IO.csproj
new file mode 100644
index 0000000000000..a7c7ac74a32b8
--- /dev/null
+++ b/src/libraries/shims/System.IO/src/System.IO.csproj
@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <StrongNameKeyId>Microsoft</StrongNameKeyId>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime\src\System.Runtime.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/libraries/System.Reflection.Extensions/ref/System.Reflection.Extensions.Forwards.cs b/src/libraries/shims/System.Reflection.Extensions/src/System.Reflection.Extensions.cs
similarity index 66%
rename from src/libraries/System.Reflection.Extensions/ref/System.Reflection.Extensions.Forwards.cs
rename to src/libraries/shims/System.Reflection.Extensions/src/System.Reflection.Extensions.cs
index e9d7a2140e5e4..23c9812c16e50 100644
--- a/src/libraries/System.Reflection.Extensions/ref/System.Reflection.Extensions.Forwards.cs
+++ b/src/libraries/shims/System.Reflection.Extensions/src/System.Reflection.Extensions.cs
@@ -1,8 +1,5 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
-// ------------------------------------------------------------------------------
-// Changes to this file must follow the https://aka.ms/api-review process.
-// ------------------------------------------------------------------------------
 
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Reflection.CustomAttributeExtensions))]
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Reflection.InterfaceMapping))]
diff --git a/src/libraries/shims/System.Reflection.Extensions/src/System.Reflection.Extensions.csproj b/src/libraries/shims/System.Reflection.Extensions/src/System.Reflection.Extensions.csproj
new file mode 100644
index 0000000000000..a7c7ac74a32b8
--- /dev/null
+++ b/src/libraries/shims/System.Reflection.Extensions/src/System.Reflection.Extensions.csproj
@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <StrongNameKeyId>Microsoft</StrongNameKeyId>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime\src\System.Runtime.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/libraries/System.Reflection/ref/System.Reflection.Forwards.cs b/src/libraries/shims/System.Reflection/src/System.Reflection.cs
similarity index 93%
rename from src/libraries/System.Reflection/ref/System.Reflection.Forwards.cs
rename to src/libraries/shims/System.Reflection/src/System.Reflection.cs
index c539b15e1336f..5a5cf3abbd7d6 100644
--- a/src/libraries/System.Reflection/ref/System.Reflection.Forwards.cs
+++ b/src/libraries/shims/System.Reflection/src/System.Reflection.cs
@@ -1,8 +1,5 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
-// ------------------------------------------------------------------------------
-// Changes to this file must follow the https://aka.ms/api-review process.
-// ------------------------------------------------------------------------------
 
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Reflection.AmbiguousMatchException))]
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Reflection.Assembly))]
diff --git a/src/libraries/shims/System.Reflection/src/System.Reflection.csproj b/src/libraries/shims/System.Reflection/src/System.Reflection.csproj
new file mode 100644
index 0000000000000..a7c7ac74a32b8
--- /dev/null
+++ b/src/libraries/shims/System.Reflection/src/System.Reflection.csproj
@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <StrongNameKeyId>Microsoft</StrongNameKeyId>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime\src\System.Runtime.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/libraries/System.Resources.Reader/ref/System.Resources.Reader.Forwards.cs b/src/libraries/shims/System.Resources.Reader/src/System.Resources.Reader.cs
similarity index 50%
rename from src/libraries/System.Resources.Reader/ref/System.Resources.Reader.Forwards.cs
rename to src/libraries/shims/System.Resources.Reader/src/System.Resources.Reader.cs
index 97ed7dbd96e51..9a4e8628283e8 100644
--- a/src/libraries/System.Resources.Reader/ref/System.Resources.Reader.Forwards.cs
+++ b/src/libraries/shims/System.Resources.Reader/src/System.Resources.Reader.cs
@@ -1,7 +1,4 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
-// ------------------------------------------------------------------------------
-// Changes to this file must follow the https://aka.ms/api-review process.
-// ------------------------------------------------------------------------------
 
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Resources.ResourceReader))]
diff --git a/src/libraries/shims/System.Resources.Reader/src/System.Resources.Reader.csproj b/src/libraries/shims/System.Resources.Reader/src/System.Resources.Reader.csproj
new file mode 100644
index 0000000000000..a7c7ac74a32b8
--- /dev/null
+++ b/src/libraries/shims/System.Resources.Reader/src/System.Resources.Reader.csproj
@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <StrongNameKeyId>Microsoft</StrongNameKeyId>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime\src\System.Runtime.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/libraries/System.Resources.ResourceManager/ref/System.Resources.ResourceManager.Forwards.cs b/src/libraries/shims/System.Resources.ResourceManager/src/System.Resources.ResourceManager.cs
similarity index 82%
rename from src/libraries/System.Resources.ResourceManager/ref/System.Resources.ResourceManager.Forwards.cs
rename to src/libraries/shims/System.Resources.ResourceManager/src/System.Resources.ResourceManager.cs
index 0460dd9dfaab6..139c2d352c308 100644
--- a/src/libraries/System.Resources.ResourceManager/ref/System.Resources.ResourceManager.Forwards.cs
+++ b/src/libraries/shims/System.Resources.ResourceManager/src/System.Resources.ResourceManager.cs
@@ -1,8 +1,5 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
-// ------------------------------------------------------------------------------
-// Changes to this file must follow the https://aka.ms/api-review process.
-// ------------------------------------------------------------------------------
 
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Resources.IResourceReader))]
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Resources.MissingManifestResourceException))]
diff --git a/src/libraries/shims/System.Resources.ResourceManager/src/System.Resources.ResourceManager.csproj b/src/libraries/shims/System.Resources.ResourceManager/src/System.Resources.ResourceManager.csproj
new file mode 100644
index 0000000000000..a7c7ac74a32b8
--- /dev/null
+++ b/src/libraries/shims/System.Resources.ResourceManager/src/System.Resources.ResourceManager.csproj
@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <StrongNameKeyId>Microsoft</StrongNameKeyId>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime\src\System.Runtime.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/libraries/shims/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.cs b/src/libraries/shims/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.cs
new file mode 100644
index 0000000000000..2e699e56389d0
--- /dev/null
+++ b/src/libraries/shims/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.cs
@@ -0,0 +1,4 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+[assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Runtime.CompilerServices.Unsafe))]
diff --git a/src/libraries/shims/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.csproj b/src/libraries/shims/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.csproj
new file mode 100644
index 0000000000000..a7c7ac74a32b8
--- /dev/null
+++ b/src/libraries/shims/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.csproj
@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <StrongNameKeyId>Microsoft</StrongNameKeyId>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime\src\System.Runtime.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/libraries/System.Runtime.Extensions/ref/System.Runtime.Extensions.Forwards.cs b/src/libraries/shims/System.Runtime.Extensions/src/System.Runtime.Extensions.cs
similarity index 96%
rename from src/libraries/System.Runtime.Extensions/ref/System.Runtime.Extensions.Forwards.cs
rename to src/libraries/shims/System.Runtime.Extensions/src/System.Runtime.Extensions.cs
index c6e0bfcc91e27..a0c31e20a18bb 100644
--- a/src/libraries/System.Runtime.Extensions/ref/System.Runtime.Extensions.Forwards.cs
+++ b/src/libraries/shims/System.Runtime.Extensions/src/System.Runtime.Extensions.cs
@@ -1,10 +1,5 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
-// ------------------------------------------------------------------------------
-// Changes to this file must follow the https://aka.ms/api-review process.
-// ------------------------------------------------------------------------------
-
-#pragma warning disable SYSLIB0003 // CAS Obsoletions
 
 [assembly:System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.AppDomain))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.AppDomainSetup))]
diff --git a/src/libraries/shims/System.Runtime.Extensions/src/System.Runtime.Extensions.csproj b/src/libraries/shims/System.Runtime.Extensions/src/System.Runtime.Extensions.csproj
new file mode 100644
index 0000000000000..a7c7ac74a32b8
--- /dev/null
+++ b/src/libraries/shims/System.Runtime.Extensions/src/System.Runtime.Extensions.csproj
@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <StrongNameKeyId>Microsoft</StrongNameKeyId>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime\src\System.Runtime.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/libraries/System.Runtime.Handles/ref/System.Runtime.Handles.Forwards.cs b/src/libraries/shims/System.Runtime.Handles/src/System.Runtime.Handles.cs
similarity index 74%
rename from src/libraries/System.Runtime.Handles/ref/System.Runtime.Handles.Forwards.cs
rename to src/libraries/shims/System.Runtime.Handles/src/System.Runtime.Handles.cs
index 40ec335e86778..7b578b2f6d51e 100644
--- a/src/libraries/System.Runtime.Handles/ref/System.Runtime.Handles.Forwards.cs
+++ b/src/libraries/shims/System.Runtime.Handles/src/System.Runtime.Handles.cs
@@ -1,8 +1,5 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
-// ------------------------------------------------------------------------------
-// Changes to this file must follow the https://aka.ms/api-review process.
-// ------------------------------------------------------------------------------
 
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(Microsoft.Win32.SafeHandles.SafeWaitHandle))]
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.IO.HandleInheritability))]
diff --git a/src/libraries/shims/System.Runtime.Handles/src/System.Runtime.Handles.csproj b/src/libraries/shims/System.Runtime.Handles/src/System.Runtime.Handles.csproj
new file mode 100644
index 0000000000000..a7c7ac74a32b8
--- /dev/null
+++ b/src/libraries/shims/System.Runtime.Handles/src/System.Runtime.Handles.csproj
@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <StrongNameKeyId>Microsoft</StrongNameKeyId>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime\src\System.Runtime.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/libraries/System.Runtime.InteropServices.RuntimeInformation/ref/System.Runtime.InteropServices.RuntimeInformation.Forwards.cs b/src/libraries/shims/System.Runtime.InteropServices.RuntimeInformation/src/System.Runtime.InteropServices.RuntimeInformation.cs
similarity index 66%
rename from src/libraries/System.Runtime.InteropServices.RuntimeInformation/ref/System.Runtime.InteropServices.RuntimeInformation.Forwards.cs
rename to src/libraries/shims/System.Runtime.InteropServices.RuntimeInformation/src/System.Runtime.InteropServices.RuntimeInformation.cs
index b4661cd4754f3..a758f1b5a10b6 100644
--- a/src/libraries/System.Runtime.InteropServices.RuntimeInformation/ref/System.Runtime.InteropServices.RuntimeInformation.Forwards.cs
+++ b/src/libraries/shims/System.Runtime.InteropServices.RuntimeInformation/src/System.Runtime.InteropServices.RuntimeInformation.cs
@@ -1,8 +1,5 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
-// ------------------------------------------------------------------------------
-// Changes to this file must follow the https://aka.ms/api-review process.
-// ------------------------------------------------------------------------------
 
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Runtime.InteropServices.Architecture))]
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Runtime.InteropServices.OSPlatform))]
diff --git a/src/libraries/shims/System.Runtime.InteropServices.RuntimeInformation/src/System.Runtime.InteropServices.RuntimeInformation.csproj b/src/libraries/shims/System.Runtime.InteropServices.RuntimeInformation/src/System.Runtime.InteropServices.RuntimeInformation.csproj
new file mode 100644
index 0000000000000..a7c7ac74a32b8
--- /dev/null
+++ b/src/libraries/shims/System.Runtime.InteropServices.RuntimeInformation/src/System.Runtime.InteropServices.RuntimeInformation.csproj
@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <StrongNameKeyId>Microsoft</StrongNameKeyId>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime\src\System.Runtime.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/libraries/System.Security.Cryptography.Algorithms/ref/System.Security.Cryptography.Algorithms.Forwards.cs b/src/libraries/shims/System.Security.Cryptography.Algorithms/src/System.Security.Cryptography.Algorithms.cs
similarity index 96%
rename from src/libraries/System.Security.Cryptography.Algorithms/ref/System.Security.Cryptography.Algorithms.Forwards.cs
rename to src/libraries/shims/System.Security.Cryptography.Algorithms/src/System.Security.Cryptography.Algorithms.cs
index 5e138286de8e0..ec9ec6aa09b27 100644
--- a/src/libraries/System.Security.Cryptography.Algorithms/ref/System.Security.Cryptography.Algorithms.Forwards.cs
+++ b/src/libraries/shims/System.Security.Cryptography.Algorithms/src/System.Security.Cryptography.Algorithms.cs
@@ -1,8 +1,5 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
-// ------------------------------------------------------------------------------
-// Changes to this file must follow the https://aka.ms/api-review process.
-// ------------------------------------------------------------------------------
 
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Security.Cryptography.Aes))]
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Security.Cryptography.AesCcm))]
diff --git a/src/libraries/shims/System.Security.Cryptography.Algorithms/src/System.Security.Cryptography.Algorithms.csproj b/src/libraries/shims/System.Security.Cryptography.Algorithms/src/System.Security.Cryptography.Algorithms.csproj
new file mode 100644
index 0000000000000..8e3a7b7f3abc4
--- /dev/null
+++ b/src/libraries/shims/System.Security.Cryptography.Algorithms/src/System.Security.Cryptography.Algorithms.csproj
@@ -0,0 +1,12 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <StrongNameKeyId>Microsoft</StrongNameKeyId>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime\src\System.Runtime.csproj" />
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Security.Cryptography\src\System.Security.Cryptography.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/libraries/System.Security.Cryptography.Cng/ref/System.Security.Cryptography.Cng.Forwards.cs b/src/libraries/shims/System.Security.Cryptography.Cng/src/System.Security.Cryptography.Cng.cs
similarity index 93%
rename from src/libraries/System.Security.Cryptography.Cng/ref/System.Security.Cryptography.Cng.Forwards.cs
rename to src/libraries/shims/System.Security.Cryptography.Cng/src/System.Security.Cryptography.Cng.cs
index 2bdc10900f7aa..4dfd200560545 100644
--- a/src/libraries/System.Security.Cryptography.Cng/ref/System.Security.Cryptography.Cng.Forwards.cs
+++ b/src/libraries/shims/System.Security.Cryptography.Cng/src/System.Security.Cryptography.Cng.cs
@@ -1,8 +1,5 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
-// ------------------------------------------------------------------------------
-// Changes to this file must follow the https://aka.ms/api-review process.
-// ------------------------------------------------------------------------------
 
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(Microsoft.Win32.SafeHandles.SafeNCryptHandle))]
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(Microsoft.Win32.SafeHandles.SafeNCryptKeyHandle))]
diff --git a/src/libraries/shims/System.Security.Cryptography.Cng/src/System.Security.Cryptography.Cng.csproj b/src/libraries/shims/System.Security.Cryptography.Cng/src/System.Security.Cryptography.Cng.csproj
new file mode 100644
index 0000000000000..8e3a7b7f3abc4
--- /dev/null
+++ b/src/libraries/shims/System.Security.Cryptography.Cng/src/System.Security.Cryptography.Cng.csproj
@@ -0,0 +1,12 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <StrongNameKeyId>Microsoft</StrongNameKeyId>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime\src\System.Runtime.csproj" />
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Security.Cryptography\src\System.Security.Cryptography.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/libraries/System.Security.Cryptography.Csp/ref/System.Security.Cryptography.Csp.Forwards.cs b/src/libraries/shims/System.Security.Cryptography.Csp/src/System.Security.Cryptography.Csp.cs
similarity index 88%
rename from src/libraries/System.Security.Cryptography.Csp/ref/System.Security.Cryptography.Csp.Forwards.cs
rename to src/libraries/shims/System.Security.Cryptography.Csp/src/System.Security.Cryptography.Csp.cs
index b79fa6a3d2e10..758cb03024105 100644
--- a/src/libraries/System.Security.Cryptography.Csp/ref/System.Security.Cryptography.Csp.Forwards.cs
+++ b/src/libraries/shims/System.Security.Cryptography.Csp/src/System.Security.Cryptography.Csp.cs
@@ -1,11 +1,5 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
-// ------------------------------------------------------------------------------
-// Changes to this file must follow the https://aka.ms/api-review process.
-// ------------------------------------------------------------------------------
-
-#pragma warning disable SYSLIB0021
-#pragma warning disable SYSLIB0023
 
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Security.Cryptography.AesCryptoServiceProvider))]
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Security.Cryptography.CspKeyContainerInfo))]
diff --git a/src/libraries/shims/System.Security.Cryptography.Csp/src/System.Security.Cryptography.Csp.csproj b/src/libraries/shims/System.Security.Cryptography.Csp/src/System.Security.Cryptography.Csp.csproj
new file mode 100644
index 0000000000000..8e3a7b7f3abc4
--- /dev/null
+++ b/src/libraries/shims/System.Security.Cryptography.Csp/src/System.Security.Cryptography.Csp.csproj
@@ -0,0 +1,12 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <StrongNameKeyId>Microsoft</StrongNameKeyId>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime\src\System.Runtime.csproj" />
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Security.Cryptography\src\System.Security.Cryptography.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/libraries/System.Security.Cryptography.Encoding/ref/System.Security.Cryptography.Encoding.Forwards.cs b/src/libraries/shims/System.Security.Cryptography.Encoding/src/System.Security.Cryptography.Encoding.cs
similarity index 86%
rename from src/libraries/System.Security.Cryptography.Encoding/ref/System.Security.Cryptography.Encoding.Forwards.cs
rename to src/libraries/shims/System.Security.Cryptography.Encoding/src/System.Security.Cryptography.Encoding.cs
index 9320139f904bb..01bdf3dd50f64 100644
--- a/src/libraries/System.Security.Cryptography.Encoding/ref/System.Security.Cryptography.Encoding.Forwards.cs
+++ b/src/libraries/shims/System.Security.Cryptography.Encoding/src/System.Security.Cryptography.Encoding.cs
@@ -1,8 +1,5 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
-// ------------------------------------------------------------------------------
-// Changes to this file must follow the https://aka.ms/api-review process.
-// ------------------------------------------------------------------------------
 
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Security.Cryptography.AsnEncodedData))]
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Security.Cryptography.AsnEncodedDataCollection))]
diff --git a/src/libraries/shims/System.Security.Cryptography.Encoding/src/System.Security.Cryptography.Encoding.csproj b/src/libraries/shims/System.Security.Cryptography.Encoding/src/System.Security.Cryptography.Encoding.csproj
new file mode 100644
index 0000000000000..8e3a7b7f3abc4
--- /dev/null
+++ b/src/libraries/shims/System.Security.Cryptography.Encoding/src/System.Security.Cryptography.Encoding.csproj
@@ -0,0 +1,12 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <StrongNameKeyId>Microsoft</StrongNameKeyId>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime\src\System.Runtime.csproj" />
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Security.Cryptography\src\System.Security.Cryptography.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/libraries/System.Security.Cryptography.OpenSsl/ref/System.Security.Cryptography.OpenSsl.Forwards.cs b/src/libraries/shims/System.Security.Cryptography.OpenSsl/src/System.Security.Cryptography.OpenSsl.cs
similarity index 74%
rename from src/libraries/System.Security.Cryptography.OpenSsl/ref/System.Security.Cryptography.OpenSsl.Forwards.cs
rename to src/libraries/shims/System.Security.Cryptography.OpenSsl/src/System.Security.Cryptography.OpenSsl.cs
index 436f6161c5638..18682a0bc8c73 100644
--- a/src/libraries/System.Security.Cryptography.OpenSsl/ref/System.Security.Cryptography.OpenSsl.Forwards.cs
+++ b/src/libraries/shims/System.Security.Cryptography.OpenSsl/src/System.Security.Cryptography.OpenSsl.cs
@@ -1,8 +1,5 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
-// ------------------------------------------------------------------------------
-// Changes to this file must follow the https://aka.ms/api-review process.
-// ------------------------------------------------------------------------------
 
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Security.Cryptography.DSAOpenSsl))]
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Security.Cryptography.ECDiffieHellmanOpenSsl))]
diff --git a/src/libraries/shims/System.Security.Cryptography.OpenSsl/src/System.Security.Cryptography.OpenSsl.csproj b/src/libraries/shims/System.Security.Cryptography.OpenSsl/src/System.Security.Cryptography.OpenSsl.csproj
new file mode 100644
index 0000000000000..8e3a7b7f3abc4
--- /dev/null
+++ b/src/libraries/shims/System.Security.Cryptography.OpenSsl/src/System.Security.Cryptography.OpenSsl.csproj
@@ -0,0 +1,12 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <StrongNameKeyId>Microsoft</StrongNameKeyId>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime\src\System.Runtime.csproj" />
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Security.Cryptography\src\System.Security.Cryptography.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/libraries/System.Security.Cryptography.Primitives/ref/System.Security.Cryptography.Primitives.Forwards.cs b/src/libraries/shims/System.Security.Cryptography.Primitives/src/System.Security.Cryptography.Primitives.cs
similarity index 89%
rename from src/libraries/System.Security.Cryptography.Primitives/ref/System.Security.Cryptography.Primitives.Forwards.cs
rename to src/libraries/shims/System.Security.Cryptography.Primitives/src/System.Security.Cryptography.Primitives.cs
index d0e7052b2c6e1..54408ce6a6ac1 100644
--- a/src/libraries/System.Security.Cryptography.Primitives/ref/System.Security.Cryptography.Primitives.Forwards.cs
+++ b/src/libraries/shims/System.Security.Cryptography.Primitives/src/System.Security.Cryptography.Primitives.cs
@@ -1,8 +1,5 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
-// ------------------------------------------------------------------------------
-// Changes to this file must follow the https://aka.ms/api-review process.
-// ------------------------------------------------------------------------------
 
 // System.Runtime
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Security.Cryptography.CryptographicException))]
@@ -24,4 +21,3 @@
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Security.Cryptography.PbeEncryptionAlgorithm))]
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Security.Cryptography.PbeParameters))]
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Security.Cryptography.SymmetricAlgorithm))]
-
diff --git a/src/libraries/shims/System.Security.Cryptography.Primitives/src/System.Security.Cryptography.Primitives.csproj b/src/libraries/shims/System.Security.Cryptography.Primitives/src/System.Security.Cryptography.Primitives.csproj
new file mode 100644
index 0000000000000..8e3a7b7f3abc4
--- /dev/null
+++ b/src/libraries/shims/System.Security.Cryptography.Primitives/src/System.Security.Cryptography.Primitives.csproj
@@ -0,0 +1,12 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <StrongNameKeyId>Microsoft</StrongNameKeyId>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime\src\System.Runtime.csproj" />
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Security.Cryptography\src\System.Security.Cryptography.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/libraries/System.Security.Cryptography.X509Certificates/ref/System.Security.Cryptography.X509Certificates.Forwards.cs b/src/libraries/shims/System.Security.Cryptography.X509Certificates/src/System.Security.Cryptography.X509Certificates.cs
similarity index 96%
rename from src/libraries/System.Security.Cryptography.X509Certificates/ref/System.Security.Cryptography.X509Certificates.Forwards.cs
rename to src/libraries/shims/System.Security.Cryptography.X509Certificates/src/System.Security.Cryptography.X509Certificates.cs
index 6827f78966d52..e20d66f865196 100644
--- a/src/libraries/System.Security.Cryptography.X509Certificates/ref/System.Security.Cryptography.X509Certificates.Forwards.cs
+++ b/src/libraries/shims/System.Security.Cryptography.X509Certificates/src/System.Security.Cryptography.X509Certificates.cs
@@ -1,8 +1,5 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
-// ------------------------------------------------------------------------------
-// Changes to this file must follow the https://aka.ms/api-review process.
-// ------------------------------------------------------------------------------
 
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(Microsoft.Win32.SafeHandles.SafeX509ChainHandle))]
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Security.Cryptography.X509Certificates.CertificateRequest))]
diff --git a/src/libraries/shims/System.Security.Cryptography.X509Certificates/src/System.Security.Cryptography.X509Certificates.csproj b/src/libraries/shims/System.Security.Cryptography.X509Certificates/src/System.Security.Cryptography.X509Certificates.csproj
new file mode 100644
index 0000000000000..8e3a7b7f3abc4
--- /dev/null
+++ b/src/libraries/shims/System.Security.Cryptography.X509Certificates/src/System.Security.Cryptography.X509Certificates.csproj
@@ -0,0 +1,12 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <StrongNameKeyId>Microsoft</StrongNameKeyId>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime\src\System.Runtime.csproj" />
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Security.Cryptography\src\System.Security.Cryptography.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/libraries/System.Security.Principal/ref/System.Security.Principal.Forwards.cs b/src/libraries/shims/System.Security.Principal/src/System.Security.Principal.cs
similarity index 70%
rename from src/libraries/System.Security.Principal/ref/System.Security.Principal.Forwards.cs
rename to src/libraries/shims/System.Security.Principal/src/System.Security.Principal.cs
index eafe571bf5f0a..fdf580f09dc31 100644
--- a/src/libraries/System.Security.Principal/ref/System.Security.Principal.Forwards.cs
+++ b/src/libraries/shims/System.Security.Principal/src/System.Security.Principal.cs
@@ -1,8 +1,5 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
-// ------------------------------------------------------------------------------
-// Changes to this file must follow the https://aka.ms/api-review process.
-// ------------------------------------------------------------------------------
 
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Security.Principal.IIdentity))]
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Security.Principal.IPrincipal))]
diff --git a/src/libraries/shims/System.Security.Principal/src/System.Security.Principal.csproj b/src/libraries/shims/System.Security.Principal/src/System.Security.Principal.csproj
new file mode 100644
index 0000000000000..a7c7ac74a32b8
--- /dev/null
+++ b/src/libraries/shims/System.Security.Principal/src/System.Security.Principal.csproj
@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <StrongNameKeyId>Microsoft</StrongNameKeyId>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime\src\System.Runtime.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/libraries/System.Security.SecureString/ref/System.Security.SecureString.Forwards.cs b/src/libraries/shims/System.Security.SecureString/src/System.Security.SecureString.cs
similarity index 58%
rename from src/libraries/System.Security.SecureString/ref/System.Security.SecureString.Forwards.cs
rename to src/libraries/shims/System.Security.SecureString/src/System.Security.SecureString.cs
index 144eeabf4ba00..b487db6219d76 100644
--- a/src/libraries/System.Security.SecureString/ref/System.Security.SecureString.Forwards.cs
+++ b/src/libraries/shims/System.Security.SecureString/src/System.Security.SecureString.cs
@@ -1,8 +1,5 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
-// ------------------------------------------------------------------------------
-// Changes to this file must follow the https://aka.ms/api-review process.
-// ------------------------------------------------------------------------------
 
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Security.SecureString))]
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Security.SecureStringMarshal))]
diff --git a/src/libraries/shims/System.Security.SecureString/src/System.Security.SecureString.csproj b/src/libraries/shims/System.Security.SecureString/src/System.Security.SecureString.csproj
new file mode 100644
index 0000000000000..71c5b6f0d01e8
--- /dev/null
+++ b/src/libraries/shims/System.Security.SecureString/src/System.Security.SecureString.csproj
@@ -0,0 +1,12 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <StrongNameKeyId>Microsoft</StrongNameKeyId>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime\src\System.Runtime.csproj" />
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime.InteropServices\src\System.Runtime.InteropServices.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/libraries/System.Text.Encoding/ref/System.Text.Encoding.Forwards.cs b/src/libraries/shims/System.Text.Encoding/src/System.Text.Encoding.cs
similarity index 86%
rename from src/libraries/System.Text.Encoding/ref/System.Text.Encoding.Forwards.cs
rename to src/libraries/shims/System.Text.Encoding/src/System.Text.Encoding.cs
index bb71e85836734..f1a0bb59587f5 100644
--- a/src/libraries/System.Text.Encoding/ref/System.Text.Encoding.Forwards.cs
+++ b/src/libraries/shims/System.Text.Encoding/src/System.Text.Encoding.cs
@@ -1,8 +1,5 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
-// ------------------------------------------------------------------------------
-// Changes to this file must follow the https://aka.ms/api-review process.
-// ------------------------------------------------------------------------------
 
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Text.Decoder))]
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Text.DecoderExceptionFallback))]
diff --git a/src/libraries/shims/System.Text.Encoding/src/System.Text.Encoding.csproj b/src/libraries/shims/System.Text.Encoding/src/System.Text.Encoding.csproj
new file mode 100644
index 0000000000000..a7c7ac74a32b8
--- /dev/null
+++ b/src/libraries/shims/System.Text.Encoding/src/System.Text.Encoding.csproj
@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <StrongNameKeyId>Microsoft</StrongNameKeyId>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime\src\System.Runtime.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/libraries/System.Threading.Tasks.Extensions/ref/System.Threading.Tasks.Extensions.Forwards.cs b/src/libraries/shims/System.Threading.Tasks.Extensions/src/System.Threading.Tasks.Extensions.cs
similarity index 100%
rename from src/libraries/System.Threading.Tasks.Extensions/ref/System.Threading.Tasks.Extensions.Forwards.cs
rename to src/libraries/shims/System.Threading.Tasks.Extensions/src/System.Threading.Tasks.Extensions.cs
diff --git a/src/libraries/shims/System.Threading.Tasks.Extensions/src/System.Threading.Tasks.Extensions.csproj b/src/libraries/shims/System.Threading.Tasks.Extensions/src/System.Threading.Tasks.Extensions.csproj
new file mode 100644
index 0000000000000..dd2453032f204
--- /dev/null
+++ b/src/libraries/shims/System.Threading.Tasks.Extensions/src/System.Threading.Tasks.Extensions.csproj
@@ -0,0 +1,7 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <ItemGroup>
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime\src\System.Runtime.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/libraries/System.Threading.Tasks/ref/System.Threading.Tasks.Forwards.cs b/src/libraries/shims/System.Threading.Tasks/src/System.Threading.Tasks.cs
similarity index 94%
rename from src/libraries/System.Threading.Tasks/ref/System.Threading.Tasks.Forwards.cs
rename to src/libraries/shims/System.Threading.Tasks/src/System.Threading.Tasks.cs
index cd1bc9fbeb31c..7c3fef9dcfd85 100644
--- a/src/libraries/System.Threading.Tasks/ref/System.Threading.Tasks.Forwards.cs
+++ b/src/libraries/shims/System.Threading.Tasks/src/System.Threading.Tasks.cs
@@ -1,8 +1,5 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
-// ------------------------------------------------------------------------------
-// Changes to this file must follow the https://aka.ms/api-review process.
-// ------------------------------------------------------------------------------
 
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.AggregateException))]
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.OperationCanceledException))]
diff --git a/src/libraries/shims/System.Threading.Tasks/src/System.Threading.Tasks.csproj b/src/libraries/shims/System.Threading.Tasks/src/System.Threading.Tasks.csproj
new file mode 100644
index 0000000000000..a7c7ac74a32b8
--- /dev/null
+++ b/src/libraries/shims/System.Threading.Tasks/src/System.Threading.Tasks.csproj
@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <StrongNameKeyId>Microsoft</StrongNameKeyId>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime\src\System.Runtime.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/libraries/System.Threading.Timer/ref/System.Threading.Timer.Forwards.cs b/src/libraries/shims/System.Threading.Timer/src/System.Threading.Timer.cs
similarity index 57%
rename from src/libraries/System.Threading.Timer/ref/System.Threading.Timer.Forwards.cs
rename to src/libraries/shims/System.Threading.Timer/src/System.Threading.Timer.cs
index 1a2c4f257ac4a..c30d5adb9ea57 100644
--- a/src/libraries/System.Threading.Timer/ref/System.Threading.Timer.Forwards.cs
+++ b/src/libraries/shims/System.Threading.Timer/src/System.Threading.Timer.cs
@@ -1,8 +1,5 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
-// ------------------------------------------------------------------------------
-// Changes to this file must follow the https://aka.ms/api-review process.
-// ------------------------------------------------------------------------------
 
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Threading.Timer))]
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Threading.TimerCallback))]
diff --git a/src/libraries/shims/System.Threading.Timer/src/System.Threading.Timer.csproj b/src/libraries/shims/System.Threading.Timer/src/System.Threading.Timer.csproj
new file mode 100644
index 0000000000000..a7c7ac74a32b8
--- /dev/null
+++ b/src/libraries/shims/System.Threading.Timer/src/System.Threading.Timer.csproj
@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <StrongNameKeyId>Microsoft</StrongNameKeyId>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime\src\System.Runtime.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/libraries/System.ValueTuple/ref/System.ValueTuple.TypeForwards.cs b/src/libraries/shims/System.ValueTuple/src/System.ValueTuple.cs
similarity index 100%
rename from src/libraries/System.ValueTuple/ref/System.ValueTuple.TypeForwards.cs
rename to src/libraries/shims/System.ValueTuple/src/System.ValueTuple.cs
diff --git a/src/libraries/shims/System.ValueTuple/src/System.ValueTuple.csproj b/src/libraries/shims/System.ValueTuple/src/System.ValueTuple.csproj
new file mode 100644
index 0000000000000..dd2453032f204
--- /dev/null
+++ b/src/libraries/shims/System.ValueTuple/src/System.ValueTuple.csproj
@@ -0,0 +1,7 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <ItemGroup>
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime\src\System.Runtime.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/libraries/System.Xml.XmlDocument/ref/System.Xml.XmlDocument.Forwards.cs b/src/libraries/shims/System.Xml.XmlDocument/src/System.Xml.XmlDocument.cs
similarity index 90%
rename from src/libraries/System.Xml.XmlDocument/ref/System.Xml.XmlDocument.Forwards.cs
rename to src/libraries/shims/System.Xml.XmlDocument/src/System.Xml.XmlDocument.cs
index b1d643ea69e10..867e6dbc1ae56 100644
--- a/src/libraries/System.Xml.XmlDocument/ref/System.Xml.XmlDocument.Forwards.cs
+++ b/src/libraries/shims/System.Xml.XmlDocument/src/System.Xml.XmlDocument.cs
@@ -1,8 +1,5 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
-// ------------------------------------------------------------------------------
-// Changes to this file must follow the https://aka.ms/api-review process.
-// ------------------------------------------------------------------------------
 
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Xml.XmlAttribute))]
 [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Xml.XmlAttributeCollection))]
diff --git a/src/libraries/shims/System.Xml.XmlDocument/src/System.Xml.XmlDocument.csproj b/src/libraries/shims/System.Xml.XmlDocument/src/System.Xml.XmlDocument.csproj
new file mode 100644
index 0000000000000..88b620e61893d
--- /dev/null
+++ b/src/libraries/shims/System.Xml.XmlDocument/src/System.Xml.XmlDocument.csproj
@@ -0,0 +1,12 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <StrongNameKeyId>Microsoft</StrongNameKeyId>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime\src\System.Runtime.csproj" />
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Xml.ReaderWriter\src\System.Xml.ReaderWriter.csproj" />
+  </ItemGroup>
+
+</Project>