diff --git a/Makefile b/Makefile
index 349f1b56ef27..c72554e5eac2 100644
--- a/Makefile
+++ b/Makefile
@@ -7,14 +7,14 @@ ifeq ($(ENABLE_BUILD), yes)
 makefiles = \
   mk/precompiled-headers.mk \
   local.mk \
-  src/libutil/local.mk
+  src/libutil/local.mk \
+  src/libstore/local.mk \
+  src/libfetchers/local.mk \
+  src/libexpr/local.mk
 
 ifdef HOST_UNIX
 makefiles += \
-  src/libstore/local.mk \
-  src/libfetchers/local.mk \
   src/libmain/local.mk \
-  src/libexpr/local.mk \
   src/libcmd/local.mk \
   src/nix/local.mk \
   src/resolve-system-dependencies/local.mk \
@@ -33,13 +33,10 @@ endif
 ifeq ($(ENABLE_BUILD)_$(ENABLE_TESTS), yes_yes)
 UNIT_TEST_ENV = _NIX_TEST_UNIT_DATA=unit-test-data
 makefiles += \
-  src/libutil/tests/local.mk
-ifdef HOST_UNIX
-makefiles += \
+  src/libutil/tests/local.mk \
   src/libstore/tests/local.mk \
   src/libexpr/tests/local.mk
 endif
-endif
 
 ifeq ($(ENABLE_TESTS), yes)
 ifdef HOST_UNIX
diff --git a/src/libexpr/eval-settings.cc b/src/libexpr/eval-settings.cc
index 444a7d7d6dc2..86cf44f25db5 100644
--- a/src/libexpr/eval-settings.cc
+++ b/src/libexpr/eval-settings.cc
@@ -1,6 +1,8 @@
 #include "users.hh"
 #include "globals.hh"
-#include "profiles.hh"
+#ifndef _WIN32
+# include "profiles.hh"
+#endif
 #include "eval.hh"
 #include "eval-settings.hh"
 
@@ -65,8 +67,10 @@ Strings EvalSettings::getDefaultNixPath()
 
     if (!evalSettings.restrictEval && !evalSettings.pureEval) {
         add(getNixDefExpr() + "/channels");
+        #ifndef _WIN32
         add(rootChannelsDir() + "/nixpkgs", "nixpkgs");
         add(rootChannelsDir());
+        #endif
     }
 
     return res;
diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc
index dfe81cbf73f4..30eecdc39f02 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -10,12 +10,15 @@
 #include "eval-inline.hh"
 #include "filetransfer.hh"
 #include "function-trace.hh"
-#include "profiles.hh"
 #include "print.hh"
 #include "fs-input-accessor.hh"
 #include "memory-input-accessor.hh"
 #include "signals.hh"
 
+#ifndef _WIN32
+# include "profiles.hh"
+#endif
+
 #include <algorithm>
 #include <chrono>
 #include <iostream>
@@ -23,14 +26,16 @@
 #include <optional>
 #include <unistd.h>
 #include <sys/time.h>
-#include <sys/resource.h>
 #include <iostream>
 #include <fstream>
 #include <functional>
 
-#include <sys/resource.h>
 #include <nlohmann/json.hpp>
 
+#ifndef _WIN32
+# include <sys/resource.h>
+#endif
+
 #if HAVE_BOEHMGC
 
 #define GC_INCLUDE_NEW
@@ -462,6 +467,8 @@ ErrorBuilder & ErrorBuilder::withFrame(const Env & env, const Expr & expr)
     return *this;
 }
 
+// Don't want Windows function
+#undef SearchPath
 
 EvalState::EvalState(
     const SearchPath & _searchPath,
@@ -2543,9 +2550,11 @@ void EvalState::maybePrintStats()
 
 void EvalState::printStatistics()
 {
+#ifndef _WIN32
     struct rusage buf;
     getrusage(RUSAGE_SELF, &buf);
     float cpuTime = buf.ru_utime.tv_sec + ((float) buf.ru_utime.tv_usec / 1000000);
+#endif
 
     uint64_t bEnvs = nrEnvs * sizeof(Env) + nrValuesInEnvs * sizeof(Value *);
     uint64_t bLists = nrListElems * sizeof(Value *);
@@ -2562,7 +2571,9 @@ void EvalState::printStatistics()
     if (outPath != "-")
         fs.open(outPath, std::fstream::out);
     json topObj = json::object();
+#ifndef _WIN32
     topObj["cpuTime"] = cpuTime;
+#endif
     topObj["envs"] = {
         {"number", nrEnvs},
         {"elements", nrValuesInEnvs},
diff --git a/src/libexpr/lexer.l b/src/libexpr/lexer.l
index a3a8608d9a76..40ab8c60217e 100644
--- a/src/libexpr/lexer.l
+++ b/src/libexpr/lexer.l
@@ -132,7 +132,7 @@ else        { return ELSE; }
 assert      { return ASSERT; }
 with        { return WITH; }
 let         { return LET; }
-in          { return IN; }
+in          { return INX; }
 rec         { return REC; }
 inherit     { return INHERIT; }
 or          { return OR_KW; }
@@ -158,7 +158,7 @@ or          { return OR_KW; }
                       .errPos = data->state.positions[CUR_POS],
                   });
               }
-              return INT;
+              return INTX;
             }
 {FLOAT}     { errno = 0;
               yylval->nf = strtod(yytext, 0);
@@ -167,7 +167,7 @@ or          { return OR_KW; }
                       .msg = hintfmt("invalid float '%1%'", yytext),
                       .errPos = data->state.positions[CUR_POS],
                   });
-              return FLOAT;
+              return FLOATX;
             }
 
 \$\{        { PUSH_STATE(DEFAULT); return DOLLAR_CURLY; }
diff --git a/src/libexpr/local.mk b/src/libexpr/local.mk
index 6579277ab943..f45ac6ac193a 100644
--- a/src/libexpr/local.mk
+++ b/src/libexpr/local.mk
@@ -11,12 +11,18 @@ libexpr_SOURCES := \
   $(wildcard $(d)/flake/*.cc) \
   $(d)/lexer-tab.cc \
   $(d)/parser-tab.cc
+ifdef HOST_UNIX
+    libexpr_SOURCES += $(wildcard $(d)/unix/*.cc)
+endif
 
 libexpr_CXXFLAGS += $(INCLUDE_libutil) $(INCLUDE_libstore) -I src/libfetchers -I src/libmain -I src/libexpr
 
 libexpr_LIBS = libutil libstore libfetchers
 
-libexpr_LDFLAGS += -lboost_context -pthread
+libexpr_LDFLAGS += -lboost_context
+ifdef HOST_UNIX
+ libexpr_LDFLAGS += -pthread
+endif
 ifdef HOST_LINUX
  libexpr_LDFLAGS += -ldl
 endif
diff --git a/src/libexpr/parser.y b/src/libexpr/parser.y
index b86cef217b4c..491b357dfe78 100644
--- a/src/libexpr/parser.y
+++ b/src/libexpr/parser.y
@@ -340,11 +340,11 @@ void yyerror(YYLTYPE * loc, yyscan_t scanner, ParseData * data, const char * err
 %type <id> attr
 %token <id> ID
 %token <str> STR IND_STR
-%token <n> INT
-%token <nf> FLOAT
+%token <n> INTX
+%token <nf> FLOATX
 %token <path> PATH HPATH SPATH PATH_END
 %token <uri> URI
-%token IF THEN ELSE ASSERT WITH LET IN REC INHERIT EQ NEQ AND OR IMPL OR_KW
+%token IF THEN ELSE ASSERT WITH LET INX REC INHERIT EQ NEQ AND OR IMPL OR_KW
 %token DOLLAR_CURLY /* == ${ */
 %token IND_STRING_OPEN IND_STRING_CLOSE
 %token ELLIPSIS
@@ -387,7 +387,7 @@ expr_function
     { $$ = new ExprAssert(CUR_POS, $2, $4); }
   | WITH expr ';' expr_function
     { $$ = new ExprWith(CUR_POS, $2, $4); }
-  | LET binds IN expr_function
+  | LET binds INX expr_function
     { if (!$2->dynamicAttrs.empty())
         throw ParseError({
             .msg = hintfmt("dynamic attributes not allowed in let"),
@@ -457,8 +457,8 @@ expr_simple
       else
           $$ = new ExprVar(CUR_POS, data->symbols.create($1));
   }
-  | INT { $$ = new ExprInt($1); }
-  | FLOAT { $$ = new ExprFloat($1); }
+  | INTX { $$ = new ExprInt($1); }
+  | FLOATX { $$ = new ExprFloat($1); }
   | '"' string_parts '"' { $$ = $2; }
   | IND_STRING_OPEN ind_string_parts IND_STRING_CLOSE {
       $$ = stripIndentation(CUR_POS, data->symbols, std::move(*$2));
diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index 8d3a18526473..06e769997388 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -25,7 +25,10 @@
 #include <algorithm>
 #include <cstring>
 #include <regex>
-#include <dlfcn.h>
+
+#ifndef _WIN32
+# include <dlfcn.h>
+#endif
 
 #include <cmath>
 
@@ -327,6 +330,8 @@ static RegisterPrimOp primop_import({
     }
 });
 
+#ifndef _WIN32
+
 /* Want reasonable symbol names, so extern C */
 /* !!! Should we pass the Pos or the file name too? */
 extern "C" typedef void (*ValueInitializer)(EvalState & state, Value & v);
@@ -399,6 +404,8 @@ void prim_exec(EvalState & state, const PosIdx pos, Value * * args, Value & v)
     }
 }
 
+#endif
+
 /* Return a string representing the type of the expression. */
 static void prim_typeOf(EvalState & state, const PosIdx pos, Value * * args, Value & v)
 {
@@ -2223,7 +2230,9 @@ static void addPath(
             arg2.mkString(
                 S_ISREG(st.st_mode) ? "regular" :
                 S_ISDIR(st.st_mode) ? "directory" :
+            #ifndef _WIN32
                 S_ISLNK(st.st_mode) ? "symlink" :
+            #endif
                 "unknown" /* not supported, will fail! */);
 
             Value * args []{&arg1, &arg2};
@@ -4458,6 +4467,7 @@ void EvalState::createBaseEnv()
         )",
     });
 
+#ifndef _WIN32
     // Miscellaneous
     if (evalSettings.enableNativeCode) {
         addPrimOp({
@@ -4471,6 +4481,7 @@ void EvalState::createBaseEnv()
             .fun = prim_exec,
         });
     }
+#endif
 
     addPrimOp({
         .name = "__traceVerbose",
diff --git a/src/libexpr/search-path.hh b/src/libexpr/search-path.hh
index ce78135b51f1..231752ea66c5 100644
--- a/src/libexpr/search-path.hh
+++ b/src/libexpr/search-path.hh
@@ -8,6 +8,9 @@
 
 namespace nix {
 
+// Do not want the windows macro (alias to `SearchPathA`)
+#undef SearchPath
+
 /**
  * A "search path" is a list of ways look for something, used with
  * `builtins.findFile` and `< >` lookup expressions.
diff --git a/src/libexpr/tests/primops.cc b/src/libexpr/tests/primops.cc
index d820b860e7cf..5ed950653741 100644
--- a/src/libexpr/tests/primops.cc
+++ b/src/libexpr/tests/primops.cc
@@ -87,11 +87,13 @@ namespace nix {
         ASSERT_THAT(*p->value, IsIntEq(123));
     }
 
+    #ifndef _WIN32
     TEST_F(PrimOpTest, getEnv) {
         setenv("_NIX_UNIT_TEST_ENV_VALUE", "test value", 1);
         auto v = eval("builtins.getEnv \"_NIX_UNIT_TEST_ENV_VALUE\"");
         ASSERT_THAT(v, IsStringEq("test value"));
     }
+    #endif
 
     TEST_F(PrimOpTest, seq) {
         ASSERT_THROW(eval("let x = throw \"test\"; in builtins.seq x { }"), ThrownError);
diff --git a/src/libfetchers/local.mk b/src/libfetchers/local.mk
index 8319cac84c1e..e447225fdfc1 100644
--- a/src/libfetchers/local.mk
+++ b/src/libfetchers/local.mk
@@ -8,6 +8,8 @@ libfetchers_SOURCES := $(wildcard $(d)/*.cc)
 
 libfetchers_CXXFLAGS += $(INCLUDE_libutil) $(INCLUDE_libstore)
 
-libfetchers_LDFLAGS += -pthread
+ifdef HOST_UNIX
+    libfetchers_LDFLAGS += -pthread
+endif
 
 libfetchers_LIBS = libutil libstore
diff --git a/src/libfetchers/git.cc b/src/libfetchers/unix/git.cc
similarity index 100%
rename from src/libfetchers/git.cc
rename to src/libfetchers/unix/git.cc
diff --git a/src/libfetchers/mercurial.cc b/src/libfetchers/unix/mercurial.cc
similarity index 100%
rename from src/libfetchers/mercurial.cc
rename to src/libfetchers/unix/mercurial.cc
diff --git a/src/libstore/filetransfer.cc b/src/libstore/filetransfer.cc
index dcbec4acd848..c88ca05de25e 100644
--- a/src/libstore/filetransfer.cc
+++ b/src/libstore/filetransfer.cc
@@ -1,5 +1,4 @@
 #include "filetransfer.hh"
-#include "namespaces.hh"
 #include "globals.hh"
 #include "store-api.hh"
 #include "s3.hh"
@@ -12,6 +11,10 @@
 #include <aws/core/client/ClientConfiguration.h>
 #endif
 
+#if __linux__
+# include "namespaces.hh"
+#endif
+
 #include <unistd.h>
 #include <fcntl.h>
 
@@ -243,12 +246,17 @@ struct curlFileTransfer : public FileTransfer
 
         int progressCallback(double dltotal, double dlnow)
         {
+            #ifndef _WIN32
             try {
-              act.progress(dlnow, dltotal);
+                act.progress(dlnow, dltotal);
             } catch (nix::Interrupted &) {
-              assert(_isInterrupted);
+                assert(_isInterrupted);
             }
             return _isInterrupted;
+            #else
+            act.progress(dlnow, dltotal);
+            return false;
+            #endif
         }
 
         static int progressCallbackWrapper(void * userp, double dltotal, double dlnow, double ultotal, double ulnow)
@@ -455,7 +463,11 @@ struct curlFileTransfer : public FileTransfer
                 if (errorSink)
                     response = std::move(errorSink->s);
                 auto exc =
+                #ifndef _WIN32
                     code == CURLE_ABORTED_BY_CALLBACK && _isInterrupted
+                #else
+                    false
+                #endif
                     ? FileTransferError(Interrupted, std::move(response), "%s of '%s' was interrupted", request.verb(), request.uri)
                     : httpStatus != 0
                     ? FileTransferError(err,
@@ -505,10 +517,12 @@ struct curlFileTransfer : public FileTransfer
 
     Sync<State> state_;
 
+    #ifndef _WIN32
     /* We can't use a std::condition_variable to wake up the curl
        thread, because it only monitors file descriptors. So use a
        pipe instead. */
     Pipe wakeupPipe;
+    #endif
 
     std::thread workerThread;
 
@@ -528,8 +542,10 @@ struct curlFileTransfer : public FileTransfer
             fileTransferSettings.httpConnections.get());
         #endif
 
+        #ifndef _WIN32
         wakeupPipe.create();
         fcntl(wakeupPipe.readSide.get(), F_SETFL, O_NONBLOCK);
+        #endif
 
         workerThread = std::thread([&]() { workerThreadEntry(); });
     }
@@ -550,17 +566,23 @@ struct curlFileTransfer : public FileTransfer
             auto state(state_.lock());
             state->quit = true;
         }
+        #ifndef _WIN32
         writeFull(wakeupPipe.writeSide.get(), " ", false);
+        #endif
     }
 
     void workerThreadMain()
     {
         /* Cause this thread to be notified on SIGINT. */
+        #ifndef _WIN32
         auto callback = createInterruptCallback([&]() {
             stopWorkerThread();
         });
+        #endif
 
+        #if __linux__
         unshareFilesystem();
+        #endif
 
         std::map<CURL *, std::shared_ptr<TransferItem>> items;
 
@@ -594,9 +616,11 @@ struct curlFileTransfer : public FileTransfer
             /* Wait for activity, including wakeup events. */
             int numfds = 0;
             struct curl_waitfd extraFDs[1];
+            #ifndef _WIN32
             extraFDs[0].fd = wakeupPipe.readSide.get();
             extraFDs[0].events = CURL_WAIT_POLLIN;
             extraFDs[0].revents = 0;
+            #endif
             long maxSleepTimeMs = items.empty() ? 10000 : 100;
             auto sleepTimeMs =
                 nextWakeup != std::chrono::steady_clock::time_point()
@@ -616,7 +640,7 @@ struct curlFileTransfer : public FileTransfer
                 char buf[1024];
                 auto res = read(extraFDs[0].fd, buf, sizeof(buf));
                 if (res == -1 && errno != EINTR)
-                    throw SysError("reading curl wakeup socket");
+                    throw PosixError("reading curl wakeup socket");
             }
 
             std::vector<std::shared_ptr<TransferItem>> incoming;
@@ -655,7 +679,9 @@ struct curlFileTransfer : public FileTransfer
     {
         try {
             workerThreadMain();
+        #ifndef _WIN32
         } catch (nix::Interrupted & e) {
+        #endif
         } catch (std::exception & e) {
             printError("unexpected error in download thread: %s", e.what());
         }
@@ -680,7 +706,9 @@ struct curlFileTransfer : public FileTransfer
                 throw nix::Error("cannot enqueue download request because the download thread is shutting down");
             state->incoming.push(item);
         }
+        #ifndef _WIN32
         writeFull(wakeupPipe.writeSide.get(), " ");
+        #endif
     }
 
 #if ENABLE_S3
diff --git a/src/libstore/globals.cc b/src/libstore/globals.cc
index cc416a4d6214..dc18a8f93720 100644
--- a/src/libstore/globals.cc
+++ b/src/libstore/globals.cc
@@ -10,13 +10,16 @@
 #include <map>
 #include <mutex>
 #include <thread>
-#include <dlfcn.h>
-#include <sys/utsname.h>
 
 #include <nlohmann/json.hpp>
 
 #include <sodium/core.h>
 
+#ifndef _WIN32
+# include <dlfcn.h>
+# include <sys/utsname.h>
+#endif
+
 #ifdef __GLIBC__
 # include <gnu/lib-names.h>
 # include <nss.h>
@@ -59,7 +62,9 @@ Settings::Settings()
     , nixManDir(canonPath(NIX_MAN_DIR))
     , nixDaemonSocketFile(canonPath(getEnvNonEmpty("NIX_DAEMON_SOCKET_PATH").value_or(nixStateDir + DEFAULT_SOCKET_PATH)))
 {
+#ifndef _WIN32
     buildUsersGroup = getuid() == 0 ? "nixbld" : "";
+#endif
     allowSymlinkedStore = getEnv("NIX_IGNORE_SYMLINK_STORE") == "1";
 
     auto sslOverride = getEnv("NIX_SSL_CERT_FILE").value_or(getEnv("SSL_CERT_FILE").value_or(""));
@@ -235,11 +240,15 @@ StringSet Settings::getDefaultExtraPlatforms()
 
 bool Settings::isWSL1()
 {
+#if __linux__
     struct utsname utsbuf;
     uname(&utsbuf);
     // WSL1 uses -Microsoft suffix
     // WSL2 uses -microsoft-standard suffix
     return hasSuffix(utsbuf.release, "-Microsoft");
+#else
+    return false;
+#endif
 }
 
 Path Settings::getDefaultSSLCertFile()
@@ -337,10 +346,14 @@ void initPlugins()
         for (const auto & file : pluginFiles) {
             /* handle is purposefully leaked as there may be state in the
                DSO needed by the action of the plugin. */
+            #ifndef _WIN32
             void *handle =
                 dlopen(file.c_str(), RTLD_LAZY | RTLD_LOCAL);
             if (!handle)
                 throw Error("could not dynamically open plugin file '%s': %s", file, dlerror());
+            #else
+                throw Error("could not dynamically open plugin file '%s'", file);
+            #endif
         }
     }
 
diff --git a/src/libstore/globals.hh b/src/libstore/globals.hh
index 27caf42c4eda..5cafa8b9132b 100644
--- a/src/libstore/globals.hh
+++ b/src/libstore/globals.hh
@@ -539,6 +539,7 @@ public:
     Setting<bool> sandboxFallback{this, true, "sandbox-fallback",
         "Whether to disable sandboxing when the kernel doesn't allow it."};
 
+#ifndef _WIN32
     Setting<bool> requireDropSupplementaryGroups{this, getuid() == 0, "require-drop-supplementary-groups",
         R"(
           Following the principle of least privilege,
@@ -556,6 +557,7 @@ public:
           (since `root` usually has permissions to call setgroups)
           and `false` otherwise.
         )"};
+#endif
 
 #if __linux__
     Setting<std::string> sandboxShmSize{
diff --git a/src/libstore/local.mk b/src/libstore/local.mk
index 4eea8caa49ee..fd330e7936ba 100644
--- a/src/libstore/local.mk
+++ b/src/libstore/local.mk
@@ -4,11 +4,20 @@ libstore_NAME = libnixstore
 
 libstore_DIR := $(d)
 
-libstore_SOURCES := $(wildcard $(d)/*.cc $(d)/builtins/*.cc $(d)/build/*.cc)
+libstore_SOURCES := $(wildcard $(d)/*.cc)
+ifdef HOST_UNIX
+    libstore_SOURCES += $(wildcard $(d)/unix/*.cc $(d)/unix/builtins/*.cc $(d)/unix/build/*.cc)
+endif
+ifdef HOST_WINDOWS
+    libstore_SOURCES += $(wildcard $(d)/windows/*.cc)
+endif
 
 libstore_LIBS = libutil
 
-libstore_LDFLAGS += $(SQLITE3_LIBS) $(LIBCURL_LIBS) $(SODIUM_LIBS) -pthread
+libstore_LDFLAGS += $(SQLITE3_LIBS) $(LIBCURL_LIBS) $(SODIUM_LIBS)
+ifdef HOST_UNIX
+    libstore_LDFLAGS += -pthread
+endif
 ifdef HOST_LINUX
     libstore_LDFLAGS += -ldl
 endif
diff --git a/src/libstore/misc.cc b/src/libstore/misc.cc
index 1035691c74e1..d66eded6e74e 100644
--- a/src/libstore/misc.cc
+++ b/src/libstore/misc.cc
@@ -1,7 +1,9 @@
 #include "derivations.hh"
 #include "parsed-derivations.hh"
 #include "globals.hh"
-#include "local-store.hh"
+#ifndef _WIN32
+# include "local-store.hh"
+#endif
 #include "store-api.hh"
 #include "thread-pool.hh"
 #include "topo-sort.hh"
diff --git a/src/libstore/sqlite.cc b/src/libstore/sqlite.cc
index d7432a3059e5..d2124f981443 100644
--- a/src/libstore/sqlite.cc
+++ b/src/libstore/sqlite.cc
@@ -8,6 +8,10 @@
 
 #include <atomic>
 
+#ifdef _WIN32
+# include <synchapi.h>
+#endif
+
 namespace nix {
 
 SQLiteError::SQLiteError(const char *path, const char *errMsg, int errNo, int extendedErrNo, int offset, hintformat && hf)
@@ -256,10 +260,14 @@ void handleSQLiteBusy(const SQLiteBusy & e, time_t & nextWarning)
     /* Sleep for a while since retrying the transaction right away
        is likely to fail again. */
     checkInterrupt();
+    #ifndef _WIN32
     struct timespec t;
     t.tv_sec = 0;
     t.tv_nsec = (random() % 100) * 1000 * 1000; /* <= 0.1s */
     nanosleep(&t, 0);
+    #else
+    Sleep(rand() % 100);
+    #endif
 }
 
 }
diff --git a/src/libstore/store-api.cc b/src/libstore/store-api.cc
index 0f88d9b92f02..70c30a82697f 100644
--- a/src/libstore/store-api.cc
+++ b/src/libstore/store-api.cc
@@ -10,13 +10,16 @@
 #include "references.hh"
 #include "archive.hh"
 #include "callback.hh"
-#include "remote-store.hh"
 // FIXME this should not be here, see TODO below on
 // `addMultipleToStore`.
 #include "worker-protocol.hh"
 #include "signals.hh"
 #include "users.hh"
 
+#ifndef _WIN32
+# include "remote-store.hh"
+#endif
+
 #include <nlohmann/json.hpp>
 #include <regex>
 
@@ -1298,9 +1301,10 @@ Derivation Store::readInvalidDerivation(const StorePath & drvPath)
 
 }
 
-
-#include "local-store.hh"
-#include "uds-remote-store.hh"
+#ifndef _WIN32
+# include "local-store.hh"
+# include "uds-remote-store.hh"
+#endif
 
 
 namespace nix {
@@ -1318,6 +1322,7 @@ std::pair<std::string, Store::Params> splitUriAndParams(const std::string & uri_
     return {uri, params};
 }
 
+#ifndef _WIN32
 static bool isNonUriPath(const std::string & spec)
 {
     return
@@ -1327,9 +1332,11 @@ static bool isNonUriPath(const std::string & spec)
         // might be special like "auto"
         && spec.find("/") != std::string::npos;
 }
+#endif
 
 std::shared_ptr<Store> openFromNonUri(const std::string & uri, const Store::Params & params)
 {
+    #ifndef _WIN32
     if (uri == "" || uri == "auto") {
         auto stateDir = getOr(params, "state", settings.nixStateDir);
         if (access(stateDir.c_str(), R_OK | W_OK) == 0)
@@ -1374,6 +1381,9 @@ std::shared_ptr<Store> openFromNonUri(const std::string & uri, const Store::Para
     } else {
         return nullptr;
     }
+    #else
+    return nullptr;
+    #endif
 }
 
 // The `parseURL` function supports both IPv6 URIs as defined in
diff --git a/src/libstore/binary-cache-store.cc b/src/libstore/unix/binary-cache-store.cc
similarity index 100%
rename from src/libstore/binary-cache-store.cc
rename to src/libstore/unix/binary-cache-store.cc
diff --git a/src/libstore/binary-cache-store.hh b/src/libstore/unix/binary-cache-store.hh
similarity index 100%
rename from src/libstore/binary-cache-store.hh
rename to src/libstore/unix/binary-cache-store.hh
diff --git a/src/libstore/daemon.cc b/src/libstore/unix/daemon.cc
similarity index 100%
rename from src/libstore/daemon.cc
rename to src/libstore/unix/daemon.cc
diff --git a/src/libstore/daemon.hh b/src/libstore/unix/daemon.hh
similarity index 100%
rename from src/libstore/daemon.hh
rename to src/libstore/unix/daemon.hh
diff --git a/src/libstore/gc.cc b/src/libstore/unix/gc.cc
similarity index 100%
rename from src/libstore/gc.cc
rename to src/libstore/unix/gc.cc
diff --git a/src/libstore/http-binary-cache-store.cc b/src/libstore/unix/http-binary-cache-store.cc
similarity index 100%
rename from src/libstore/http-binary-cache-store.cc
rename to src/libstore/unix/http-binary-cache-store.cc
diff --git a/src/libstore/http-binary-cache-store.md b/src/libstore/unix/http-binary-cache-store.md
similarity index 100%
rename from src/libstore/http-binary-cache-store.md
rename to src/libstore/unix/http-binary-cache-store.md
diff --git a/src/libstore/legacy-ssh-store.cc b/src/libstore/unix/legacy-ssh-store.cc
similarity index 100%
rename from src/libstore/legacy-ssh-store.cc
rename to src/libstore/unix/legacy-ssh-store.cc
diff --git a/src/libstore/legacy-ssh-store.md b/src/libstore/unix/legacy-ssh-store.md
similarity index 100%
rename from src/libstore/legacy-ssh-store.md
rename to src/libstore/unix/legacy-ssh-store.md
diff --git a/src/libstore/local-binary-cache-store.cc b/src/libstore/unix/local-binary-cache-store.cc
similarity index 100%
rename from src/libstore/local-binary-cache-store.cc
rename to src/libstore/unix/local-binary-cache-store.cc
diff --git a/src/libstore/local-binary-cache-store.md b/src/libstore/unix/local-binary-cache-store.md
similarity index 100%
rename from src/libstore/local-binary-cache-store.md
rename to src/libstore/unix/local-binary-cache-store.md
diff --git a/src/libstore/local-store.cc b/src/libstore/unix/local-store.cc
similarity index 100%
rename from src/libstore/local-store.cc
rename to src/libstore/unix/local-store.cc
diff --git a/src/libstore/local-store.hh b/src/libstore/unix/local-store.hh
similarity index 100%
rename from src/libstore/local-store.hh
rename to src/libstore/unix/local-store.hh
diff --git a/src/libstore/local-store.md b/src/libstore/unix/local-store.md
similarity index 100%
rename from src/libstore/local-store.md
rename to src/libstore/unix/local-store.md
diff --git a/src/libstore/lock.cc b/src/libstore/unix/lock.cc
similarity index 100%
rename from src/libstore/lock.cc
rename to src/libstore/unix/lock.cc
diff --git a/src/libstore/lock.hh b/src/libstore/unix/lock.hh
similarity index 100%
rename from src/libstore/lock.hh
rename to src/libstore/unix/lock.hh
diff --git a/src/libstore/optimise-store.cc b/src/libstore/unix/optimise-store.cc
similarity index 100%
rename from src/libstore/optimise-store.cc
rename to src/libstore/unix/optimise-store.cc
diff --git a/src/libstore/pathlocks.cc b/src/libstore/unix/pathlocks.cc
similarity index 100%
rename from src/libstore/pathlocks.cc
rename to src/libstore/unix/pathlocks.cc
diff --git a/src/libstore/pathlocks.hh b/src/libstore/unix/pathlocks.hh
similarity index 100%
rename from src/libstore/pathlocks.hh
rename to src/libstore/unix/pathlocks.hh
diff --git a/src/libstore/profiles.cc b/src/libstore/unix/profiles.cc
similarity index 100%
rename from src/libstore/profiles.cc
rename to src/libstore/unix/profiles.cc
diff --git a/src/libstore/profiles.hh b/src/libstore/unix/profiles.hh
similarity index 100%
rename from src/libstore/profiles.hh
rename to src/libstore/unix/profiles.hh
diff --git a/src/libstore/remote-fs-accessor.cc b/src/libstore/unix/remote-fs-accessor.cc
similarity index 100%
rename from src/libstore/remote-fs-accessor.cc
rename to src/libstore/unix/remote-fs-accessor.cc
diff --git a/src/libstore/remote-fs-accessor.hh b/src/libstore/unix/remote-fs-accessor.hh
similarity index 100%
rename from src/libstore/remote-fs-accessor.hh
rename to src/libstore/unix/remote-fs-accessor.hh
diff --git a/src/libstore/remote-store-connection.hh b/src/libstore/unix/remote-store-connection.hh
similarity index 100%
rename from src/libstore/remote-store-connection.hh
rename to src/libstore/unix/remote-store-connection.hh
diff --git a/src/libstore/remote-store.cc b/src/libstore/unix/remote-store.cc
similarity index 100%
rename from src/libstore/remote-store.cc
rename to src/libstore/unix/remote-store.cc
diff --git a/src/libstore/remote-store.hh b/src/libstore/unix/remote-store.hh
similarity index 100%
rename from src/libstore/remote-store.hh
rename to src/libstore/unix/remote-store.hh
diff --git a/src/libstore/ssh-store.cc b/src/libstore/unix/ssh-store.cc
similarity index 100%
rename from src/libstore/ssh-store.cc
rename to src/libstore/unix/ssh-store.cc
diff --git a/src/libstore/ssh-store.md b/src/libstore/unix/ssh-store.md
similarity index 100%
rename from src/libstore/ssh-store.md
rename to src/libstore/unix/ssh-store.md
diff --git a/src/libstore/ssh.cc b/src/libstore/unix/ssh.cc
similarity index 100%
rename from src/libstore/ssh.cc
rename to src/libstore/unix/ssh.cc
diff --git a/src/libstore/ssh.hh b/src/libstore/unix/ssh.hh
similarity index 100%
rename from src/libstore/ssh.hh
rename to src/libstore/unix/ssh.hh
diff --git a/src/libstore/uds-remote-store.cc b/src/libstore/unix/uds-remote-store.cc
similarity index 100%
rename from src/libstore/uds-remote-store.cc
rename to src/libstore/unix/uds-remote-store.cc
diff --git a/src/libstore/uds-remote-store.hh b/src/libstore/unix/uds-remote-store.hh
similarity index 100%
rename from src/libstore/uds-remote-store.hh
rename to src/libstore/unix/uds-remote-store.hh
diff --git a/src/libstore/uds-remote-store.md b/src/libstore/unix/uds-remote-store.md
similarity index 100%
rename from src/libstore/uds-remote-store.md
rename to src/libstore/unix/uds-remote-store.md
diff --git a/src/libstore/windows/build.cc b/src/libstore/windows/build.cc
new file mode 100644
index 000000000000..3eadc5bdaf3c
--- /dev/null
+++ b/src/libstore/windows/build.cc
@@ -0,0 +1,37 @@
+#include "store-api.hh"
+#include "build-result.hh"
+
+namespace nix {
+
+void Store::buildPaths(const std::vector<DerivedPath> & reqs, BuildMode buildMode, std::shared_ptr<Store> evalStore)
+{
+    unsupported("buildPaths");
+}
+
+std::vector<KeyedBuildResult> Store::buildPathsWithResults(
+    const std::vector<DerivedPath> & reqs,
+    BuildMode buildMode,
+    std::shared_ptr<Store> evalStore)
+{
+    unsupported("buildPathsWithResults");
+}
+
+BuildResult Store::buildDerivation(const StorePath & drvPath, const BasicDerivation & drv,
+    BuildMode buildMode)
+{
+    unsupported("buildDerivation");
+}
+
+
+void Store::ensurePath(const StorePath & path)
+{
+    unsupported("ensurePath");
+}
+
+
+void Store::repairPath(const StorePath & path)
+{
+    unsupported("repairPath");
+}
+
+}