diff --git a/platforms/Windows/bld/asserts/bld.asserts.wixproj b/platforms/Windows/bld/asserts/bld.asserts.wixproj
index b27679a7..d21050ef 100644
--- a/platforms/Windows/bld/asserts/bld.asserts.wixproj
+++ b/platforms/Windows/bld/asserts/bld.asserts.wixproj
@@ -15,7 +15,7 @@
   <ItemGroup>
     <HarvestDirectory Include="$(ImageRoot)\Toolchains\$(ProductVersion)+Asserts\usr\lib\clang">
       <ComponentGroupName>ClangResources_asserts</ComponentGroupName>
-      <DirectoryRefId>_usr_lib_clang</DirectoryRefId>
+      <DirectoryRefId>toolchain_asserts_usr_lib_clang</DirectoryRefId>
       <PreprocessorVariable>var._USR_LIB_CLANG</PreprocessorVariable>
       <SuppressCom>true</SuppressCom>
       <SuppressRegistry>true</SuppressRegistry>
@@ -26,7 +26,7 @@
   <ItemGroup>
     <HarvestDirectory Include="$(ImageRoot)\Toolchains\$(ProductVersion)+Asserts\usr\lib\swift\clang">
       <ComponentGroupName>SwiftClangResources_asserts</ComponentGroupName>
-      <DirectoryRefId>_usr_lib_swift_clang</DirectoryRefId>
+      <DirectoryRefId>toolchain_asserts_usr_lib_swift_clang</DirectoryRefId>
       <PreprocessorVariable>var._USR_LIB_SWIFT_CLANG</PreprocessorVariable>
       <SuppressCom>true</SuppressCom>
       <SuppressRegistry>true</SuppressRegistry>
diff --git a/platforms/Windows/bld/bld.wxi b/platforms/Windows/bld/bld.wxi
index dcde0200..30cb1f8a 100644
--- a/platforms/Windows/bld/bld.wxi
+++ b/platforms/Windows/bld/bld.wxi
@@ -16,28 +16,28 @@
     <WixVariable Id="SideBySidePackageUpgradeCode" Value="$(BldAssertsUpgradeCode)" />
     <FeatureGroupRef Id="SideBySideUpgradeStrategy" />
 
-    <DirectoryRef Id="_usr_include">
-      <Directory Id="_usr_include_llvm_c" Name="llvm-c" />
-      <Directory Id="_usr_include_swift" Name="swift" />
+    <DirectoryRef Id="toolchain_asserts_usr_include">
+      <Directory Id="toolchain_asserts_usr_include_llvm_c" Name="llvm-c" />
+      <Directory Id="toolchain_asserts_usr_include_swift" Name="swift" />
     </DirectoryRef>
 
-    <DirectoryRef Id="_usr_lib_swift">
-      <Directory Id="_usr_lib_swift_migrator" Name="migrator" />
-      <Directory Id="_usr_lib_swift_swiftToCxx" Name="swiftToCxx" />
+    <DirectoryRef Id="toolchain_asserts_usr_lib_swift">
+      <Directory Id="toolchain_asserts_usr_lib_swift_migrator" Name="migrator" />
+      <Directory Id="toolchain_asserts_usr_lib_swift_swiftToCxx" Name="swiftToCxx" />
     </DirectoryRef>
 
-    <DirectoryRef Id="_usr_share">
-      <Directory Id="_usr_share_clang" Name="clang" />
-      <Directory Id="_usr_share_swift" Name="swift" />
-      <Directory Id="_usr_share_doc" Name="doc">
-        <Directory Id="_usr_share_doc_swift" Name="swift">
-          <Directory Id="_usr_share_doc_swift_diagnostics" Name="diagnostics">
+    <DirectoryRef Id="toolchain_asserts_usr_share">
+      <Directory Id="toolchain_asserts_usr_share_clang" Name="clang" />
+      <Directory Id="toolchain_asserts_usr_share_swift" Name="swift" />
+      <Directory Id="toolchain_asserts_usr_share_doc" Name="doc">
+        <Directory Id="toolchain_asserts_usr_share_doc_swift" Name="swift">
+          <Directory Id="toolchain_asserts_usr_share_doc_swift_diagnostics" Name="diagnostics">
           </Directory>
         </Directory>
       </Directory>
     </DirectoryRef>
 
-    <ComponentGroup Id="cmark_gfm" Directory="_usr_bin">
+    <ComponentGroup Id="cmark_gfm" Directory="toolchain_asserts_usr_bin">
       <Component>
         <File Source="$(ToolchainRoot)\usr\bin/cmark-gfm.dll" />
       </Component>
@@ -46,7 +46,7 @@
       </Component>
     </ComponentGroup>
 
-    <ComponentGroup Id="binutils" Directory="_usr_bin">
+    <ComponentGroup Id="binutils" Directory="toolchain_asserts_usr_bin">
       <!-- TODO(compnerd) can we use symbolic links to llvm-ar.exe instead? -->
       <Component>
         <File Source="$(ToolchainRoot)\usr\bin\llvm-dlltool.exe" />
@@ -145,26 +145,26 @@
     </ComponentGroup>
 
     <ComponentGroup Id="lto">
-      <Component Directory="_usr_bin">
+      <Component Directory="toolchain_asserts_usr_bin">
         <File Source="$(ToolchainRoot)\usr\bin\LTO.dll" />
       </Component>
 
-      <Component Directory="_usr_lib">
+      <Component Directory="toolchain_asserts_usr_lib">
         <File Source="$(ToolchainRoot)\usr\lib\LTO.lib" />
       </Component>
 
-      <Component Directory="_usr_include_llvm_c">
+      <Component Directory="toolchain_asserts_usr_include_llvm_c">
         <File Source="$(ToolchainRoot)\usr\include\llvm-c\lto.h" />
       </Component>
     </ComponentGroup>
 
-    <ComponentGroup Id="ClangFeatures" Directory="_usr_share_clang">
+    <ComponentGroup Id="ClangFeatures" Directory="toolchain_asserts_usr_share_clang">
       <Component>
         <File Source="$(ToolchainRoot)\usr\share\clang\features.json" />
       </Component>
     </ComponentGroup>
 
-    <ComponentGroup Id="clang" Directory="_usr_bin">
+    <ComponentGroup Id="clang" Directory="toolchain_asserts_usr_bin">
       <ComponentGroupRef Id="ClangFeatures" />
 
       <!-- TODO(compnerd) can we use symbolic links to clang.exe instead? -->
@@ -195,7 +195,7 @@
       -->
     </ComponentGroup>
 
-    <ComponentGroup Id="lld" Directory="_usr_bin">
+    <ComponentGroup Id="lld" Directory="toolchain_asserts_usr_bin">
       <!-- TODO(compnerd) can we use symbolic links to lld.exe instead? -->
       <Component>
         <File Source="$(ToolchainRoot)\usr\bin\ld.lld.exe" />
@@ -215,11 +215,11 @@
     </ComponentGroup>
 
     <ComponentGroup Id="BlocksRuntime">
-      <Component Directory="_usr_bin">
+      <Component Directory="toolchain_asserts_usr_bin">
         <File Source="$(ToolchainRoot)\usr\bin\BlocksRuntime.dll" />
       </Component>
 
-      <Component Directory="_usr_lib">
+      <Component Directory="toolchain_asserts_usr_lib">
         <File Source="$(ToolchainRoot)\usr\lib\BlocksRuntime.lib" />
       </Component>
 
@@ -227,18 +227,18 @@
     </ComponentGroup>
 
     <ComponentGroup Id="libdispatch">
-      <Component Directory="_usr_bin">
+      <Component Directory="toolchain_asserts_usr_bin">
         <File Source="$(ToolchainRoot)\usr\bin\dispatch.dll" />
       </Component>
 
-      <Component Directory="_usr_lib">
+      <Component Directory="toolchain_asserts_usr_lib">
         <File Source="$(ToolchainRoot)\usr\lib\dispatch.lib" />
       </Component>
 
       <!-- TODO(compnerd) should we install the dispatch headers? -->
     </ComponentGroup>
 
-    <ComponentGroup Id="SwiftCxx" Directory="_usr_lib_swift_swiftToCxx">
+    <ComponentGroup Id="SwiftCxx" Directory="toolchain_asserts_usr_lib_swift_swiftToCxx">
       <Component>
         <File Source="$(ToolchainRoot)\usr\lib\swift\swiftToCxx\_SwiftCxxInteroperability.h" />
       </Component>
@@ -249,27 +249,27 @@
         <File Source="$(ToolchainRoot)\usr\lib\swift\swiftToCxx\experimental-interoperability-version.json" />
       </Component>
 
-      <Component Directory="_usr_include_swift">
+      <Component Directory="toolchain_asserts_usr_include_swift">
         <File Source="$(ToolchainRoot)\usr\include\swift\bridging.modulemap" />
       </Component>
-      <Component Directory="_usr_include_swift">
+      <Component Directory="toolchain_asserts_usr_include_swift">
         <File Source="$(ToolchainRoot)\usr\include\swift\bridging" />
       </Component>
-      <Component Directory="_usr_include_swift">
+      <Component Directory="toolchain_asserts_usr_include_swift">
         <File Source="$(ToolchainRoot)\usr\include\module.modulemap" />
       </Component>
     </ComponentGroup>
 
     <ComponentGroup Id="SwiftDemangle">
-      <Component Directory="_usr_bin">
+      <Component Directory="toolchain_asserts_usr_bin">
         <File Source="$(ToolchainRoot)\usr\bin\swiftDemangle.dll" />
       </Component>
-      <Component Directory="_usr_lib">
+      <Component Directory="toolchain_asserts_usr_lib">
         <File Source="$(ToolchainRoot)\usr\lib\swiftDemangle.lib" />
       </Component>
     </ComponentGroup>
 
-    <ComponentGroup Id="SwiftEducationalNotes" Directory="_usr_share_doc_swift_diagnostics">
+    <ComponentGroup Id="SwiftEducationalNotes" Directory="toolchain_asserts_usr_share_doc_swift_diagnostics">
       <Component>
         <File Source="$(ToolchainRoot)\usr\share\doc\swift\diagnostics\dynamic-callable-requirements.md" />
       </Component>
@@ -308,13 +308,13 @@
       </Component>
     </ComponentGroup>
 
-    <ComponentGroup Id="SwiftFeatures" Directory="_usr_share_swift">
+    <ComponentGroup Id="SwiftFeatures" Directory="toolchain_asserts_usr_share_swift">
       <Component>
         <File Source="$(ToolchainRoot)\usr\share\swift\features.json" />
       </Component>
     </ComponentGroup>
 
-    <ComponentGroup Id="SwiftMigrator" Directory="_usr_lib_swift_migrator">
+    <ComponentGroup Id="SwiftMigrator" Directory="toolchain_asserts_usr_lib_swift_migrator">
       <Component>
         <File Source="$(ToolchainRoot)\usr\lib\swift\migrator\ios4.json" />
       </Component>
@@ -347,7 +347,7 @@
       </Component>
     </ComponentGroup>
 
-    <ComponentGroup Id="swift" Directory="_usr_bin">
+    <ComponentGroup Id="swift" Directory="toolchain_asserts_usr_bin">
       <ComponentGroupRef Id="SwiftCxx" />
       <ComponentGroupRef Id="SwiftDemangle" />
       <ComponentGroupRef Id="SwiftEducationalNotes" />
@@ -372,7 +372,7 @@
       </Component>
     </ComponentGroup>
 
-    <ComponentGroup Id="SwiftMacros" Directory="_usr_bin">
+    <ComponentGroup Id="SwiftMacros" Directory="toolchain_asserts_usr_bin">
       <Component>
         <File Source="$(ToolchainRoot)\usr\bin\ObservationMacros.dll" />
       </Component>
@@ -381,25 +381,25 @@
       </Component>
     </ComponentGroup>
 
-    <ComponentGroup Id="FoundationMacros" Directory="_usr_bin">
+    <ComponentGroup Id="FoundationMacros" Directory="toolchain_asserts_usr_bin">
       <Component>
         <File Source="$(ToolchainRoot)\usr\bin\FoundationMacros.dll" />
       </Component>
     </ComponentGroup>
 
-    <ComponentGroup Id="TestingMacros" Directory="_usr_bin">
+    <ComponentGroup Id="TestingMacros" Directory="toolchain_asserts_usr_bin">
       <Component>
         <File Source="$(ToolchainRoot)\usr\bin\TestingMacros.dll" />
       </Component>
     </ComponentGroup>
 
-    <ComponentGroup Id="argument_parser" Directory="_usr_bin">
+    <ComponentGroup Id="argument_parser" Directory="toolchain_asserts_usr_bin">
       <Component>
         <File Source="$(ToolchainRoot)\usr\bin\ArgumentParser.dll" />
       </Component>
     </ComponentGroup>
 
-    <ComponentGroup Id="tools_support_core" Directory="_usr_bin">
+    <ComponentGroup Id="tools_support_core" Directory="toolchain_asserts_usr_bin">
       <Component>
         <File Source="$(ToolchainRoot)\usr\bin\TSCBasic.dll" />
       </Component>
@@ -408,7 +408,7 @@
       </Component>
     </ComponentGroup>
 
-    <ComponentGroup Id="swift_driver" Directory="_usr_bin">
+    <ComponentGroup Id="swift_driver" Directory="toolchain_asserts_usr_bin">
       <!-- TODO(compnerd) can we use symbolic links to swift.exe instead? -->
       <Component>
         <File Name="swiftc.exe" Source="$(ToolchainRoot)\usr\bin\swift-driver.exe" />
@@ -432,7 +432,7 @@
       </Component>
     </ComponentGroup>
 
-   <ComponentGroup Id="compiler_swift_syntax" Directory="_usr_bin">
+   <ComponentGroup Id="compiler_swift_syntax" Directory="toolchain_asserts_usr_bin">
       <Component>
         <File Source="$(ToolchainRoot)\usr\bin\_CompilerSwiftBasicFormat.dll" />
       </Component>
@@ -474,7 +474,7 @@
       </Component>
     </ComponentGroup>
 
-    <ComponentGroup Id="swift_syntax" Directory="_usr_bin">
+    <ComponentGroup Id="swift_syntax" Directory="toolchain_asserts_usr_bin">
       <Component>
         <File Source="$(ToolchainRoot)\usr\bin\SwiftBasicFormat.dll" />
       </Component>
@@ -516,7 +516,7 @@
       </Component>
     </ComponentGroup>
 
-    <ComponentGroup Id="plugin_server" Directory="_usr_bin">
+    <ComponentGroup Id="plugin_server" Directory="toolchain_asserts_usr_bin">
       <Component>
         <File Source="$(ToolchainRoot)\usr\bin\swift-plugin-server.exe" />
       </Component>
@@ -525,7 +525,7 @@
       </Component>
     </ComponentGroup>
 
-    <ComponentGroup Id="mimalloc" Directory="_usr_bin">
+    <ComponentGroup Id="mimalloc" Directory="toolchain_asserts_usr_bin">
       <Component>
         <File Source="$(ToolchainRoot)\usr\bin\mimalloc.dll" />
       </Component>
@@ -539,13 +539,13 @@
     </ComponentGroup>
 
     <ComponentGroup Id="Configuration">
-      <Component Directory="ToolchainsVersioned">
+      <Component Directory="ToolchainVersionedAsserts">
         <File Source="$(ToolchainRoot)\ToolchainInfo.plist" />
       </Component>
     </ComponentGroup>
 
     <ComponentGroup Id="EnvironmentVariables">
-      <Component Id="UserPathVariable" Condition="NOT ALLUSERS=1" Directory="_usr_bin" Guid="ab52b870-23ee-42e8-9581-3fcbdfb9228c">
+      <Component Id="UserPathVariable" Condition="NOT ALLUSERS=1" Directory="toolchain_asserts_usr_bin" Guid="ab52b870-23ee-42e8-9581-3fcbdfb9228c">
         <Environment Action="set" Name="Path" Part="last" Permanent="no" System="no" Value="[_usr_bin]" />
       </Component>
     </ComponentGroup>
diff --git a/platforms/Windows/cli/asserts/cli.asserts.wixproj b/platforms/Windows/cli/asserts/cli.asserts.wixproj
index 40eba18b..3c4d0bd9 100644
--- a/platforms/Windows/cli/asserts/cli.asserts.wixproj
+++ b/platforms/Windows/cli/asserts/cli.asserts.wixproj
@@ -17,7 +17,7 @@
   <ItemGroup Condition=" '$(INCLUDE_SWIFT_DOCC)' == 'True' ">
     <HarvestDirectory Include="$(SWIFT_DOCC_RENDER_ARTIFACT_ROOT)\dist">
       <ComponentGroupName>DocCRender_asserts</ComponentGroupName>
-      <DirectoryRefId>_usr_share_docc_render</DirectoryRefId>
+      <DirectoryRefId>toolchain_asserts_usr_share_docc_render</DirectoryRefId>
       <PreprocessorVariable>var.SWIFT_DOCC_RENDER_ARTIFACT_ROOT_DIST</PreprocessorVariable>
       <SuppressCom>true</SuppressCom>
       <SuppressRegistry>true</SuppressRegistry>
diff --git a/platforms/Windows/cli/cli.wxi b/platforms/Windows/cli/cli.wxi
index 2bec3125..e44f5b68 100644
--- a/platforms/Windows/cli/cli.wxi
+++ b/platforms/Windows/cli/cli.wxi
@@ -16,33 +16,33 @@
     <WixVariable Id="SideBySidePackageUpgradeCode" Value="$(CliAssertsUpgradeCode)" />
     <FeatureGroupRef Id="SideBySideUpgradeStrategy" />
 
-    <DirectoryRef Id="_usr_include">
-      <Directory Id="_usr_include__InternalSwiftScan" Name="_InternalSwiftScan" />
-      <Directory Id="_usr_include_clang_c" Name="clang-c" />
-      <Directory Id="_usr_include_indexstore" Name="indexstore" />
+    <DirectoryRef Id="toolchain_asserts_usr_include">
+      <Directory Id="toolchain_asserts_usr_include__InternalSwiftScan" Name="_InternalSwiftScan" />
+      <Directory Id="toolchain_asserts_usr_include_clang_c" Name="clang-c" />
+      <Directory Id="toolchain_asserts_usr_include_indexstore" Name="indexstore" />
     </DirectoryRef>
 
-    <DirectoryRef Id="_usr_lib_swift">
+    <DirectoryRef Id="toolchain_asserts_usr_lib_swift">
       <Directory Name="pm">
-        <Directory Id="_usr_lib_swift_pm_ManifestAPI" Name="ManifestAPI" />
-        <Directory Id="_usr_lib_swift_pm_PluginAPI" Name="PluginAPI" />
+        <Directory Id="toolchain_asserts_usr_lib_swift_pm_ManifestAPI" Name="ManifestAPI" />
+        <Directory Id="toolchain_asserts_usr_lib_swift_pm_PluginAPI" Name="PluginAPI" />
       </Directory>
     </DirectoryRef>
 
-    <DirectoryRef Id="_usr_share">
-      <Directory Id="_usr_share_pm" Name="pm">
-        <Directory Id="_usr_share_pm_SWBAndroidPlatform" Name="SwiftBuild_SWBAndroidPlatform.resources" />
-        <Directory Id="_usr_share_pm_SWBApplePlatform" Name="SwiftBuild_SWBApplePlatform.resources" />
-        <Directory Id="_usr_share_pm_SWBCore" Name="SwiftBuild_SWBCore.resources" />
-        <Directory Id="_usr_share_pm_SWBGenericUnixPlatform" Name="SwiftBuild_SWBGenericUnixPlatform.resources" />
-        <Directory Id="_usr_share_pm_SWBQNXPlatform" Name="SwiftBuild_SWBQNXPlatform.resources" />
-        <Directory Id="_usr_share_pm_SWBUniversalPlatform" Name="SwiftBuild_SWBUniversalPlatform.resources" />
-        <Directory Id="_usr_share_pm_SWBWebAssemblyPlatform" Name="SwiftBuild_SWBWebAssemblyPlatform.resources" />
-        <Directory Id="_usr_share_pm_SWBWindowsPlatform" Name="SwiftBuild_SWBWindowsPlatform.resources" />
+    <DirectoryRef Id="toolchain_asserts_usr_share">
+      <Directory Id="toolchain_asserts_usr_share_pm" Name="pm">
+        <Directory Id="toolchain_asserts_usr_share_pm_SWBAndroidPlatform" Name="SwiftBuild_SWBAndroidPlatform.resources" />
+        <Directory Id="toolchain_asserts_usr_share_pm_SWBApplePlatform" Name="SwiftBuild_SWBApplePlatform.resources" />
+        <Directory Id="toolchain_asserts_usr_share_pm_SWBCore" Name="SwiftBuild_SWBCore.resources" />
+        <Directory Id="toolchain_asserts_usr_share_pm_SWBGenericUnixPlatform" Name="SwiftBuild_SWBGenericUnixPlatform.resources" />
+        <Directory Id="toolchain_asserts_usr_share_pm_SWBQNXPlatform" Name="SwiftBuild_SWBQNXPlatform.resources" />
+        <Directory Id="toolchain_asserts_usr_share_pm_SWBUniversalPlatform" Name="SwiftBuild_SWBUniversalPlatform.resources" />
+        <Directory Id="toolchain_asserts_usr_share_pm_SWBWebAssemblyPlatform" Name="SwiftBuild_SWBWebAssemblyPlatform.resources" />
+        <Directory Id="toolchain_asserts_usr_share_pm_SWBWindowsPlatform" Name="SwiftBuild_SWBWindowsPlatform.resources" />
       </Directory>
     </DirectoryRef>
 
-    <ComponentGroup Id="clang" Directory="_usr_bin">
+    <ComponentGroup Id="clang" Directory="toolchain_asserts_usr_bin">
       <Component>
         <File Source="$(ToolchainRoot)\usr\bin\clang-format.exe" />
       </Component>
@@ -56,12 +56,12 @@
       </Component>
     </ComponentGroup>
 
-    <ComponentGroup Id="libclang" Directory="_usr_include_clang_c">
-      <Component Directory="_usr_bin">
+    <ComponentGroup Id="libclang" Directory="toolchain_asserts_usr_include_clang_c">
+      <Component Directory="toolchain_asserts_usr_bin">
         <File Source="$(ToolchainRoot)\usr\bin\libclang.dll" />
       </Component>
 
-      <Component Directory="_usr_lib">
+      <Component Directory="toolchain_asserts_usr_lib">
         <File Source="$(ToolchainRoot)\usr\lib\libclang.lib" />
       </Component>
 
@@ -94,12 +94,12 @@
       </Component>
     </ComponentGroup>
 
-    <ComponentGroup Id="IndexStore" Directory="_usr_include_indexstore">
-      <Component Directory="_usr_bin">
+    <ComponentGroup Id="IndexStore" Directory="toolchain_asserts_usr_include_indexstore">
+      <Component Directory="toolchain_asserts_usr_bin">
         <File Source="$(ToolchainRoot)\usr\bin\libIndexStore.dll" />
       </Component>
 
-      <Component Directory="_usr_lib">
+      <Component Directory="toolchain_asserts_usr_lib">
         <File Source="$(ToolchainRoot)\usr\lib\libIndexStore.lib" />
       </Component>
 
@@ -111,12 +111,12 @@
       </Component>
     </ComponentGroup>
 
-    <ComponentGroup Id="_InternalSwiftScan" Directory="_usr_include__InternalSwiftScan">
-      <Component Directory="_usr_bin">
+    <ComponentGroup Id="_InternalSwiftScan" Directory="toolchain_asserts_usr_include__InternalSwiftScan">
+      <Component Directory="toolchain_asserts_usr_bin">
         <File Source="$(ToolchainRoot)\usr\bin\_InternalSwiftScan.dll" />
       </Component>
 
-      <Component Directory="_usr_lib">
+      <Component Directory="toolchain_asserts_usr_lib">
         <File Source="$(ToolchainRoot)\usr\lib\swift\windows\_InternalSwiftScan.lib" />
       </Component>
 
@@ -131,7 +131,7 @@
       </Component>
     </ComponentGroup>
 
-    <ComponentGroup Id="collections" Directory="_usr_bin">
+    <ComponentGroup Id="collections" Directory="toolchain_asserts_usr_bin">
       <Component>
         <File Source="$(ToolchainRoot)\usr\bin\Collections.dll" />
       </Component>
@@ -146,13 +146,13 @@
       </Component>
     </ComponentGroup>
 
-    <ComponentGroup Id="llbuild" Directory="_usr_bin">
+    <ComponentGroup Id="llbuild" Directory="toolchain_asserts_usr_bin">
       <Component>
         <File Source="$(ToolchainRoot)\usr\bin\llbuildSwift.dll" />
       </Component>
     </ComponentGroup>
 
-    <ComponentGroup Id="CompilerPluginSupport" Directory="_usr_lib_swift_pm_ManifestAPI">
+    <ComponentGroup Id="CompilerPluginSupport" Directory="toolchain_asserts_usr_lib_swift_pm_ManifestAPI">
       <Component>
         <File Source="$(ToolchainRoot)\usr\lib\swift\pm\ManifestAPI\CompilerPluginSupport.dll" />
       </Component>
@@ -167,7 +167,7 @@
       </Component>
     </ComponentGroup>
 
-    <ComponentGroup Id="PackageDescription" Directory="_usr_lib_swift_pm_ManifestAPI">
+    <ComponentGroup Id="PackageDescription" Directory="toolchain_asserts_usr_lib_swift_pm_ManifestAPI">
       <Component>
         <File Source="$(ToolchainRoot)\usr\lib\swift\pm\ManifestAPI\PackageDescription.dll" />
       </Component>
@@ -182,7 +182,7 @@
       </Component>
     </ComponentGroup>
 
-    <ComponentGroup Id="PackagePlugin" Directory="_usr_lib_swift_pm_PluginAPI">
+    <ComponentGroup Id="PackagePlugin" Directory="toolchain_asserts_usr_lib_swift_pm_PluginAPI">
       <Component>
         <File Source="$(ToolchainRoot)\usr\lib\swift\pm\PluginAPI\PackagePlugin.dll" />
       </Component>
@@ -197,12 +197,12 @@
       </Component>
     </ComponentGroup>
 
-    <ComponentGroup Id="SWBAndroidPlatformResources" Directory="_usr_share_pm_SWBAndroidPlatform">
+    <ComponentGroup Id="SWBAndroidPlatformResources" Directory="toolchain_asserts_usr_share_pm_SWBAndroidPlatform">
       <Component>
         <File Source="$(ToolchainRoot)\usr\share\pm\SwiftBuild_SWBAndroidPlatform.resources\Android.xcspec" />
       </Component>
     </ComponentGroup>
-    <ComponentGroup Id="SWBApplePlatformResources" Directory="_usr_share_pm_SWBApplePlatform">
+    <ComponentGroup Id="SWBApplePlatformResources" Directory="toolchain_asserts_usr_share_pm_SWBApplePlatform">
       <Component>
         <File Source="$(ToolchainRoot)\usr\share\pm\SwiftBuild_SWBApplePlatform.resources\AppIntentsMetadata.xcspec" />
       </Component>
@@ -414,7 +414,7 @@
         <File Source="$(ToolchainRoot)\usr\share\pm\SwiftBuild_SWBApplePlatform.resources\xrOSSimulator.xcspec" />
       </Component>
     </ComponentGroup>
-    <ComponentGroup Id="SWBCoreResources" Directory="_usr_share_pm_SWBCore">
+    <ComponentGroup Id="SWBCoreResources" Directory="toolchain_asserts_usr_share_pm_SWBCore">
       <Component>
         <File Source="$(ToolchainRoot)\usr\share\pm\SwiftBuild_SWBCore.resources\CoreBuildSystem.xcspec" />
       </Component>
@@ -425,7 +425,7 @@
         <File Source="$(ToolchainRoot)\usr\share\pm\SwiftBuild_SWBCore.resources\NativeBuildSystem.xcspec" />
       </Component>
     </ComponentGroup>
-    <ComponentGroup Id="SWBGenericUnixPlatformResources" Directory="_usr_share_pm_SWBGenericUnixPlatform">
+    <ComponentGroup Id="SWBGenericUnixPlatformResources" Directory="toolchain_asserts_usr_share_pm_SWBGenericUnixPlatform">
       <Component>
         <File Source="$(ToolchainRoot)\usr\share\pm\SwiftBuild_SWBGenericUnixPlatform.resources\Unix.xcspec" />
       </Component>
@@ -439,7 +439,7 @@
         <File Source="$(ToolchainRoot)\usr\share\pm\SwiftBuild_SWBGenericUnixPlatform.resources\UnixLibtool.xcspec" />
       </Component>
     </ComponentGroup>
-    <ComponentGroup Id="SWBQNXPlatformResources" Directory="_usr_share_pm_SWBQNXPlatform">
+    <ComponentGroup Id="SWBQNXPlatformResources" Directory="toolchain_asserts_usr_share_pm_SWBQNXPlatform">
       <Component>
         <File Source="$(ToolchainRoot)\usr\share\pm\SwiftBuild_SWBQNXPlatform.resources\QNX.xcspec" />
       </Component>
@@ -453,7 +453,7 @@
         <File Source="$(ToolchainRoot)\usr\share\pm\SwiftBuild_SWBQNXPlatform.resources\QNXLibtool.xcspec" />
       </Component>
     </ComponentGroup>
-    <ComponentGroup Id="SWBUniversalPlatformResources" Directory="_usr_share_pm_SWBUniversalPlatform">
+    <ComponentGroup Id="SWBUniversalPlatformResources" Directory="toolchain_asserts_usr_share_pm_SWBUniversalPlatform">
       <Component>
         <File Source="$(ToolchainRoot)\usr\share\pm\SwiftBuild_SWBUniversalPlatform.resources\BuiltInBuildRules.xcbuildrules" />
       </Component>
@@ -545,7 +545,7 @@
         <File Source="$(ToolchainRoot)\usr\share\pm\SwiftBuild_SWBUniversalPlatform.resources\swift-stdlib-tool.xcspec" />
       </Component>
     </ComponentGroup>
-    <ComponentGroup Id="SWBWebAssemblyPlatformResources" Directory="_usr_share_pm_SWBWebAssemblyPlatform">
+    <ComponentGroup Id="SWBWebAssemblyPlatformResources" Directory="toolchain_asserts_usr_share_pm_SWBWebAssemblyPlatform">
       <Component>
         <File Source="$(ToolchainRoot)\usr\share\pm\SwiftBuild_SWBWebAssemblyPlatform.resources\WasmCompile.xcspec" />
       </Component>
@@ -559,7 +559,7 @@
         <File Source="$(ToolchainRoot)\usr\share\pm\SwiftBuild_SWBWebAssemblyPlatform.resources\WebAssembly.xcspec" />
       </Component>
     </ComponentGroup>
-    <ComponentGroup Id="SWBWindowsPlatformResources" Directory="_usr_share_pm_SWBWindowsPlatform">
+    <ComponentGroup Id="SWBWindowsPlatformResources" Directory="toolchain_asserts_usr_share_pm_SWBWindowsPlatform">
       <Component>
         <File Source="$(ToolchainRoot)\usr\share\pm\SwiftBuild_SWBWindowsPlatform.resources\Windows.xcspec" />
       </Component>
@@ -574,7 +574,7 @@
       </Component>
     </ComponentGroup>
 
-    <ComponentGroup Id="SwiftBuild" Directory="_usr_bin">
+    <ComponentGroup Id="SwiftBuild" Directory="toolchain_asserts_usr_bin">
       <ComponentGroupRef Id="SWBAndroidPlatformResources" />
       <ComponentGroupRef Id="SWBApplePlatformResources" />
       <ComponentGroupRef Id="SWBCoreResources" />
@@ -655,7 +655,7 @@
       </Component>
     </ComponentGroup>
 
-    <ComponentGroup Id="package_manager" Directory="_usr_bin">
+    <ComponentGroup Id="package_manager" Directory="toolchain_asserts_usr_bin">
       <ComponentGroupRef Id="CompilerPluginSupport" />
       <ComponentGroupRef Id="PackageDescription" />
       <ComponentGroupRef Id="PackagePlugin" />
@@ -719,7 +719,7 @@
       <!-- FIXME(compnerd) we should include the SPM import libraries -->
     </ComponentGroup>
 
-    <ComponentGroup Id="DocC" Directory="_usr_bin">
+    <ComponentGroup Id="DocC" Directory="toolchain_asserts_usr_bin">
       <?if $(INCLUDE_SWIFT_DOCC) = True?>
         <Component>
           <File Source="$(SWIFT_DOCC_BUILD)\docc.exe" />
@@ -727,7 +727,7 @@
       <?endif?>
     </ComponentGroup>
 
-    <ComponentGroup Id="swift_format" Directory="_usr_bin">
+    <ComponentGroup Id="swift_format" Directory="toolchain_asserts_usr_bin">
       <Component>
         <File Source="$(ToolchainRoot)\usr\bin\swift-format.exe" />
       </Component>
diff --git a/platforms/Windows/dbg/dbg.wxi b/platforms/Windows/dbg/dbg.wxi
index 8d9273e0..5185d705 100644
--- a/platforms/Windows/dbg/dbg.wxi
+++ b/platforms/Windows/dbg/dbg.wxi
@@ -16,117 +16,117 @@
     <WixVariable Id="SideBySidePackageUpgradeCode" Value="$(DbgAssertsUpgradeCode)" />
     <FeatureGroupRef Id="SideBySideUpgradeStrategy" />
 
-    <DirectoryRef Id="_usr_include">
-      <Directory Id="_usr_include__InternalSwiftStaticMirror" Name="_InternalSwiftStaticMirror" />
+    <DirectoryRef Id="toolchain_asserts_usr_include">
+      <Directory Id="toolchain_asserts_usr_include__InternalSwiftStaticMirror" Name="_InternalSwiftStaticMirror" />
     </DirectoryRef>
 
-    <DirectoryRef Id="_usr_lib">
+    <DirectoryRef Id="toolchain_asserts_usr_lib">
       <Directory Name="site-packages">
-        <Directory Id="_usr_lib_site_packages_lldb" Name="lldb">
-          <Directory Id="_usr_lib_site_packages_lldb_formatters" Name="formatters">
-            <Directory Id="_usr_lib_site_packages_lldb_formatters_cpp" Name="cpp" />
+        <Directory Id="toolchain_asserts_usr_lib_site_packages_lldb" Name="lldb">
+          <Directory Id="toolchain_asserts_usr_lib_site_packages_lldb_formatters" Name="formatters">
+            <Directory Id="toolchain_asserts_usr_lib_site_packages_lldb_formatters_cpp" Name="cpp" />
           </Directory>
-          <Directory Id="_usr_lib_site_packages_lldb_utils" Name="utils" />
+          <Directory Id="toolchain_asserts_usr_lib_site_packages_lldb_utils" Name="utils" />
         </Directory>
       </Directory>
     </DirectoryRef>
 
     <ComponentGroup Id="LLDB">
-      <Component Directory="_usr_bin">
+      <Component Directory="toolchain_asserts_usr_bin">
         <File Source="$(ToolchainRoot)\usr\bin\lldb.exe" />
       </Component>
 
-      <Component Directory="_usr_bin">
+      <Component Directory="toolchain_asserts_usr_bin">
         <File Source="$(ToolchainRoot)\usr\bin\liblldb.dll" />
       </Component>
 
-      <Component Directory="_usr_lib">
+      <Component Directory="toolchain_asserts_usr_lib">
         <File Source="$(ToolchainRoot)\usr\lib\liblldb.lib" />
       </Component>
 
-      <Component Directory="_usr_lib_site_packages_lldb">
+      <Component Directory="toolchain_asserts_usr_lib_site_packages_lldb">
         <File Source="$(ToolchainRoot)\usr\lib\site-packages\lldb\__init__.py" />
       </Component>
-      <Component Directory="_usr_lib_site_packages_lldb">
+      <Component Directory="toolchain_asserts_usr_lib_site_packages_lldb">
         <File Source="$(ToolchainRoot)\usr\lib\site-packages\lldb\_lldb.pyd" />
       </Component>
-      <Component Directory="_usr_lib_site_packages_lldb">
+      <Component Directory="toolchain_asserts_usr_lib_site_packages_lldb">
         <File Source="$(ToolchainRoot)\usr\lib\site-packages\lldb\embedded_interpreter.py" />
       </Component>
-      <Component Directory="_usr_lib_site_packages_lldb">
+      <Component Directory="toolchain_asserts_usr_lib_site_packages_lldb">
         <File Source="$(ToolchainRoot)\usr\lib\site-packages\lldb\lldb-argdumper.exe" />
       </Component>
 
-      <Component Directory="_usr_lib_site_packages_lldb_formatters">
+      <Component Directory="toolchain_asserts_usr_lib_site_packages_lldb_formatters">
         <File Source="$(ToolchainRoot)\usr\lib\site-packages\lldb\formatters\Logger.py" />
       </Component>
-      <Component Directory="_usr_lib_site_packages_lldb_formatters">
+      <Component Directory="toolchain_asserts_usr_lib_site_packages_lldb_formatters">
         <File Source="$(ToolchainRoot)\usr\lib\site-packages\lldb\formatters\__init__.py" />
       </Component>
-      <Component Directory="_usr_lib_site_packages_lldb_formatters">
+      <Component Directory="toolchain_asserts_usr_lib_site_packages_lldb_formatters">
         <File Source="$(ToolchainRoot)\usr\lib\site-packages\lldb\formatters\attrib_fromdict.py" />
       </Component>
-      <Component Directory="_usr_lib_site_packages_lldb_formatters">
+      <Component Directory="toolchain_asserts_usr_lib_site_packages_lldb_formatters">
         <File Source="$(ToolchainRoot)\usr\lib\site-packages\lldb\formatters\cache.py" />
       </Component>
-      <Component Directory="_usr_lib_site_packages_lldb_formatters">
+      <Component Directory="toolchain_asserts_usr_lib_site_packages_lldb_formatters">
         <File Source="$(ToolchainRoot)\usr\lib\site-packages\lldb\formatters\metrics.py" />
       </Component>
-      <Component Directory="_usr_lib_site_packages_lldb_formatters">
+      <Component Directory="toolchain_asserts_usr_lib_site_packages_lldb_formatters">
         <File Source="$(ToolchainRoot)\usr\lib\site-packages\lldb\formatters\synth.py" />
       </Component>
 
-      <Component Directory="_usr_lib_site_packages_lldb_formatters_cpp">
+      <Component Directory="toolchain_asserts_usr_lib_site_packages_lldb_formatters_cpp">
         <File Source="$(ToolchainRoot)\usr\lib\site-packages\lldb\formatters\cpp\__init__.py" />
       </Component>
-      <Component Directory="_usr_lib_site_packages_lldb_formatters_cpp">
+      <Component Directory="toolchain_asserts_usr_lib_site_packages_lldb_formatters_cpp">
         <File Source="$(ToolchainRoot)\usr\lib\site-packages\lldb\formatters\cpp\gnu_libstdcpp.py" />
       </Component>
-      <Component Directory="_usr_lib_site_packages_lldb_formatters_cpp">
+      <Component Directory="toolchain_asserts_usr_lib_site_packages_lldb_formatters_cpp">
         <File Source="$(ToolchainRoot)\usr\lib\site-packages\lldb\formatters\cpp\libcxx.py" />
       </Component>
 
-      <Component Directory="_usr_lib_site_packages_lldb_utils">
+      <Component Directory="toolchain_asserts_usr_lib_site_packages_lldb_utils">
         <File Source="$(ToolchainRoot)\usr\lib\site-packages\lldb\utils\__init__.py" />
       </Component>
-      <Component Directory="_usr_lib_site_packages_lldb_utils">
+      <Component Directory="toolchain_asserts_usr_lib_site_packages_lldb_utils">
         <File Source="$(ToolchainRoot)\usr\lib\site-packages\lldb\utils\in_call_stack.py" />
       </Component>
-      <Component Directory="_usr_lib_site_packages_lldb_utils">
+      <Component Directory="toolchain_asserts_usr_lib_site_packages_lldb_utils">
         <File Source="$(ToolchainRoot)\usr\lib\site-packages\lldb\utils\symbolication.py" />
       </Component>
     </ComponentGroup>
 
     <ComponentGroup Id="LLDBServer">
-      <Component Directory="_usr_bin">
+      <Component Directory="toolchain_asserts_usr_bin">
         <File Source="$(ToolchainRoot)\usr\bin\lldb-server.exe" />
       </Component>
     </ComponentGroup>
 
     <ComponentGroup Id="SwiftREPL">
-      <Component Directory="_usr_bin">
+      <Component Directory="toolchain_asserts_usr_bin">
         <File Source="$(ToolchainRoot)\usr\bin\repl_swift.exe" />
       </Component>
     </ComponentGroup>
 
     <ComponentGroup Id="SwiftSynthesizeInterface">
-      <Component Directory="_usr_bin">
+      <Component Directory="toolchain_asserts_usr_bin">
         <File Source="$(ToolchainRoot)\usr\bin\swift-synthesize-interface.exe" />
       </Component>
     </ComponentGroup>
 
     <ComponentGroup Id="SwiftInspect">
-      <Component Directory="_usr_bin">
+      <Component Directory="toolchain_asserts_usr_bin">
         <File Source="$(ToolchainRoot)\usr\bin\swift-inspect.exe" />
       </Component>
     </ComponentGroup>
 
-    <ComponentGroup Id="_InternalSwiftStaticMirror" Directory="_usr_include__InternalSwiftStaticMirror">
-      <Component Directory="_usr_bin">
+    <ComponentGroup Id="_InternalSwiftStaticMirror" Directory="toolchain_asserts_usr_include__InternalSwiftStaticMirror">
+      <Component Directory="toolchain_asserts_usr_bin">
         <File Source="$(ToolchainRoot)\usr\bin\_InternalSwiftStaticMirror.dll" />
       </Component>
 
-      <Component Directory="_usr_lib">
+      <Component Directory="toolchain_asserts_usr_lib">
         <File Source="$(ToolchainRoot)\usr\lib\swift\windows\_InternalSwiftStaticMirror.lib" />
       </Component>
 
diff --git a/platforms/Windows/ide/ide.wxi b/platforms/Windows/ide/ide.wxi
index 46e22e45..0c36c0d3 100644
--- a/platforms/Windows/ide/ide.wxi
+++ b/platforms/Windows/ide/ide.wxi
@@ -16,45 +16,45 @@
     <WixVariable Id="SideBySidePackageUpgradeCode" Value="$(IdeAssertsUpgradeCode)" />
     <FeatureGroupRef Id="SideBySideUpgradeStrategy" />
 
-    <DirectoryRef Id="_usr_include">
-      <Directory Id="_usr_include_SourceKit" Name="SourceKit" />
+    <DirectoryRef Id="toolchain_asserts_usr_include">
+      <Directory Id="toolchain_asserts_usr_include_SourceKit" Name="SourceKit" />
     </DirectoryRef>
 
-    <ComponentGroup Id="clangd" Directory="_usr_bin">
+    <ComponentGroup Id="clangd" Directory="toolchain_asserts_usr_bin">
       <Component>
         <File Source="$(ToolchainRoot)\usr\bin\clangd.exe" />
       </Component>
     </ComponentGroup>
 
-    <ComponentGroup Id="lldb" Directory="_usr_bin">
+    <ComponentGroup Id="lldb" Directory="toolchain_asserts_usr_bin">
       <Component>
         <File Source="$(ToolchainRoot)\usr\bin\lldb-dap.exe" />
       </Component>
     </ComponentGroup>
 
     <ComponentGroup Id="sourcekitd">
-      <Component Directory="_usr_bin">
+      <Component Directory="toolchain_asserts_usr_bin">
         <File Source="$(ToolchainRoot)\usr\bin\sourcekitdInProc.dll" />
       </Component>
 
-      <Component Directory="_usr_lib">
+      <Component Directory="toolchain_asserts_usr_lib">
         <File Source="$(ToolchainRoot)\usr\lib\sourcekitdInProc.lib" />
       </Component>
 
-      <Component Directory="_usr_bin">
+      <Component Directory="toolchain_asserts_usr_bin">
         <File Source="$(ToolchainRoot)\usr\lib\SwiftSourceKitPlugin.dll" />
       </Component>
 
-      <Component Directory="_usr_bin">
+      <Component Directory="toolchain_asserts_usr_bin">
         <File Source="$(ToolchainRoot)\usr\lib\SwiftSourceKitClientPlugin.dll" />
       </Component>
 
-      <Component Directory="_usr_include_SourceKit">
+      <Component Directory="toolchain_asserts_usr_include_SourceKit">
         <File Source="$(ToolchainRoot)\usr\include\SourceKit\sourcekitd.h" />
       </Component>
     </ComponentGroup>
 
-    <ComponentGroup Id="lsp" Directory="_usr_bin">
+    <ComponentGroup Id="lsp" Directory="toolchain_asserts_usr_bin">
       <Component>
         <File Source="$(ToolchainRoot)\usr\bin\sourcekit-lsp.exe" />
       </Component>
diff --git a/platforms/Windows/shared/shared.wxs b/platforms/Windows/shared/shared.wxs
index b1dd1330..41e6deda 100644
--- a/platforms/Windows/shared/shared.wxs
+++ b/platforms/Windows/shared/shared.wxs
@@ -38,19 +38,19 @@
   <Fragment>
     <DirectoryRef Id="INSTALLROOT">
         <Directory Name="Toolchains">
-          <Directory Id="ToolchainsVersioned" Name="$(ProductVersion)+Asserts">
-            <Directory Id="_usr" Name="usr">
-              <Directory Id="_usr_bin" Name="bin" />
-              <Directory Id="_usr_include" Name="include" />
-              <Directory Id="_usr_lib" Name="lib">
-                <Directory Id="_usr_lib_clang" Name="clang" />
-                <Directory Id="_usr_lib_swift" Name="swift">
-                  <Directory Id="_usr_lib_swift_clang" Name="clang" />
+          <Directory Id="ToolchainVersionedAsserts" Name="$(ProductVersion)+Asserts">
+            <Directory Id="toolchain_asserts_usr" Name="usr">
+              <Directory Id="toolchain_asserts_usr_bin" Name="bin" />
+              <Directory Id="toolchain_asserts_usr_include" Name="include" />
+              <Directory Id="toolchain_asserts_usr_lib" Name="lib">
+                <Directory Id="toolchain_asserts_usr_lib_clang" Name="clang" />
+                <Directory Id="toolchain_asserts_usr_lib_swift" Name="swift">
+                  <Directory Id="toolchain_asserts_usr_lib_swift_clang" Name="clang" />
                 </Directory>
               </Directory>
-              <Directory Id="_usr_share" Name="share">
-                <Directory Id="_usr_share_docc" Name="docc">
-                  <Directory Id="_usr_share_docc_render" Name="render" />
+              <Directory Id="toolchain_asserts_usr_share" Name="share">
+                <Directory Id="toolchain_asserts_usr_share_docc" Name="docc">
+                  <Directory Id="toolchain_asserts_usr_share_docc_render" Name="render" />
                 </Directory>
               </Directory>
             </Directory>
@@ -83,8 +83,8 @@
       </Component>
 
       <Component Id="VersionedDirectoryCleanupToolchains">
-        <RegistryValue Root="HKCU" Key="SOFTWARE\!(loc.ManufacturerName)\Installer\$(ProductVersion)\!(bind.Property.UpgradeCode)" Name="ToolchainsVersioned" Value="[ToolchainsVersioned]" />
-        <util:RemoveFolderEx Property="TOOLCHAINSVERSIONED" Condition="TOOLCHAINSVERSIONED" />
+        <RegistryValue Root="HKCU" Key="SOFTWARE\!(loc.ManufacturerName)\Installer\$(ProductVersion)\!(bind.Property.UpgradeCode)" Name="ToolchainVersionedAsserts" Value="[ToolchainVersionedAsserts]" />
+        <util:RemoveFolderEx Property="TOOLCHAINVERSIONEDASSERTS" Condition="TOOLCHAINVERSIONEDASSERTS" />
       </Component>
     </ComponentGroup>
 
@@ -100,8 +100,8 @@
       <RegistrySearch Root="HKCU" Key="SOFTWARE\!(loc.ManufacturerName)\Installer\$(ProductVersion)\!(bind.Property.UpgradeCode)" Name="RuntimesVersioned" Type="directory" />
     </Property>
 
-    <Property Id="TOOLCHAINSVERSIONED">
-      <RegistrySearch Root="HKCU" Key="SOFTWARE\!(loc.ManufacturerName)\Installer\$(ProductVersion)\!(bind.Property.UpgradeCode)" Name="ToolchainsVersioned" Type="directory" />
+    <Property Id="TOOLCHAINVERSIONEDASSERTS">
+      <RegistrySearch Root="HKCU" Key="SOFTWARE\!(loc.ManufacturerName)\Installer\$(ProductVersion)\!(bind.Property.UpgradeCode)" Name="ToolchainVersionedAsserts" Type="directory" />
     </Property>
   </Fragment>