diff --git a/tier1/tier1.vcxproj b/tier1/tier1.vcxproj
index 7ac9bfc3..9ca2bf41 100644
--- a/tier1/tier1.vcxproj
+++ b/tier1/tier1.vcxproj
@@ -22,6 +22,7 @@
     <ProjectName>tier1</ProjectName>
     <ProjectGuid>{E1DA8DB8-FB4C-4B14-91A6-98BCED6B9720}</ProjectGuid>
     <RootNamespace>tier1</RootNamespace>
+    <WindowsTargetPlatformVersion>10.0.18362.0</WindowsTargetPlatformVersion>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
@@ -30,7 +31,7 @@
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>StaticLibrary</ConfigurationType>
-    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset>v143</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
     <ConfigurationType>StaticLibrary</ConfigurationType>
@@ -38,7 +39,7 @@
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>StaticLibrary</ConfigurationType>
-    <PlatformToolset>v120</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
@@ -153,7 +154,7 @@
     <ClCompile>
       <Optimization>Disabled</Optimization>
       <AdditionalIncludeDirectories>..\public;..\public\tier0;..\public\tier1;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>_HAS_ITERATOR_DEBUGGING=0;_ALLOW_RUNTIME_LIBRARY_MISMATCH;_ALLOW_ITERATOR_DEBUG_LEVEL_MISMATCH;_ALLOW_MSC_VER_MISMATCH;WIN32;_WIN32;COMPILER_MSVC;COMPILER_MSVC32;_DEBUG;DEBUG;_LIB;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_DEPRECATE;TIER1_STATIC_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>_HAS_ITERATOR_DEBUGGING=0;_ALLOW_RUNTIME_LIBRARY_MISMATCH;_ALLOW_ITERATOR_DEBUG_LEVEL_MISMATCH;_ALLOW_MSC_VER_MISMATCH;WIN32;_WIN32;COMPILER_MSVC;COMPILER_MSVC64;_DEBUG;DEBUG;_LIB;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_DEPRECATE;TIER1_STATIC_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <StringPooling>true</StringPooling>
       <ExceptionHandling>
       </ExceptionHandling>
@@ -268,7 +269,7 @@
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <FavorSizeOrSpeed>Speed</FavorSizeOrSpeed>
       <AdditionalIncludeDirectories>..\public;..\public\tier0;..\public\tier1;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>_HAS_ITERATOR_DEBUGGING=0;_ALLOW_RUNTIME_LIBRARY_MISMATCH;_ALLOW_ITERATOR_DEBUG_LEVEL_MISMATCH;_ALLOW_MSC_VER_MISMATCH;WIN64;_WIN64;COMPILER_MSVC;COMPILER_MSVC64;NDEBUG;_LIB;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_DEPRECATE;TIER1_STATIC_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>_HAS_ITERATOR_DEBUGGING=0;_ALLOW_RUNTIME_LIBRARY_MISMATCH;_ALLOW_ITERATOR_DEBUG_LEVEL_MISMATCH;_ALLOW_MSC_VER_MISMATCH;WIN;_WIN32;COMPILER_MSVC;COMPILER_MSVC64;NDEBUG;_LIB;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_DEPRECATE;TIER1_STATIC_LIB;X64BITS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <StringPooling>true</StringPooling>
       <ExceptionHandling>
       </ExceptionHandling>
@@ -323,7 +324,6 @@
     <ClCompile Include="checksum_crc.cpp" />
     <ClCompile Include="checksum_md5.cpp" />
     <ClCompile Include="commandbuffer.cpp" />
-    <ClCompile Include="convar.cpp" />
     <ClCompile Include="datamanager.cpp" />
     <ClCompile Include="diff.cpp" />
     <ClCompile Include="generichash.cpp" />
@@ -342,9 +342,7 @@
     <ClCompile Include="strtools.cpp" />
     <ClCompile Include="tier1.cpp" />
     <ClCompile Include="uniqueid.cpp" />
-    <ClCompile Include="utlbuffer.cpp" />
     <ClCompile Include="utlbufferutil.cpp" />
-    <ClCompile Include="utlstring.cpp" />
     <ClCompile Include="utlsymbol.cpp" />
   </ItemGroup>
   <ItemGroup>
@@ -396,7 +394,6 @@
     <ClInclude Include="..\public\tier1\utlrbtree.h" />
     <ClInclude Include="..\public\tier1\UtlSortVector.h" />
     <ClInclude Include="..\public\tier1\utlstack.h" />
-    <ClInclude Include="..\public\tier1\utlstring.h" />
     <ClInclude Include="..\public\tier1\UtlStringMap.h" />
     <ClInclude Include="..\public\tier1\utlsymbol.h" />
     <ClInclude Include="..\public\tier1\utlvector.h" />
diff --git a/tier1/tier1.vcxproj.filters b/tier1/tier1.vcxproj.filters
index 3811c24f..6cc14921 100644
--- a/tier1/tier1.vcxproj.filters
+++ b/tier1/tier1.vcxproj.filters
@@ -29,9 +29,6 @@
     <ClCompile Include="commandbuffer.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
-    <ClCompile Include="convar.cpp">
-      <Filter>Source Files</Filter>
-    </ClCompile>
     <ClCompile Include="datamanager.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
@@ -71,15 +68,9 @@
     <ClCompile Include="uniqueid.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
-    <ClCompile Include="utlbuffer.cpp">
-      <Filter>Source Files</Filter>
-    </ClCompile>
     <ClCompile Include="utlbufferutil.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
-    <ClCompile Include="utlstring.cpp">
-      <Filter>Source Files</Filter>
-    </ClCompile>
     <ClCompile Include="utlsymbol.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
@@ -229,9 +220,6 @@
     <ClInclude Include="..\public\tier1\utlstack.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\public\tier1\utlstring.h">
-      <Filter>Header Files</Filter>
-    </ClInclude>
     <ClInclude Include="..\public\tier1\UtlStringMap.h">
       <Filter>Header Files</Filter>
     </ClInclude>