diff --git a/r5dev/vproj/clientsdk.vcxproj b/r5dev/vproj/clientsdk.vcxproj
index 740aca5d..1ebcecaf 100644
--- a/r5dev/vproj/clientsdk.vcxproj
+++ b/r5dev/vproj/clientsdk.vcxproj
@@ -43,6 +43,7 @@
     <ClCompile Include="..\engine\host.cpp" />
     <ClCompile Include="..\engine\host_cmd.cpp" />
     <ClCompile Include="..\engine\host_state.cpp" />
+    <ClCompile Include="..\engine\matsys_interface.cpp" />
     <ClCompile Include="..\engine\modelloader.cpp" />
     <ClCompile Include="..\engine\net.cpp" />
     <ClCompile Include="..\engine\networkstringtable.cpp" />
@@ -204,6 +205,7 @@
     <ClInclude Include="..\engine\host.h" />
     <ClInclude Include="..\engine\host_cmd.h" />
     <ClInclude Include="..\engine\host_state.h" />
+    <ClInclude Include="..\engine\matsys_interface.h" />
     <ClInclude Include="..\engine\modelloader.h" />
     <ClInclude Include="..\engine\net.h" />
     <ClInclude Include="..\engine\networkstringtable.h" />
@@ -291,6 +293,7 @@
     <ClInclude Include="..\public\ihandleentity.h" />
     <ClInclude Include="..\public\imaterial.h" />
     <ClInclude Include="..\public\imaterialinternal.h" />
+    <ClInclude Include="..\public\imaterialsystem.h" />
     <ClInclude Include="..\public\inetchannel.h" />
     <ClInclude Include="..\public\inetmessage.h" />
     <ClInclude Include="..\public\inetmsghandler.h" />
diff --git a/r5dev/vproj/clientsdk.vcxproj.filters b/r5dev/vproj/clientsdk.vcxproj.filters
index be385a60..2e0f11c1 100644
--- a/r5dev/vproj/clientsdk.vcxproj.filters
+++ b/r5dev/vproj/clientsdk.vcxproj.filters
@@ -642,6 +642,9 @@
     <ClCompile Include="..\public\utility\sigcache.cpp">
       <Filter>sdk\public\utility</Filter>
     </ClCompile>
+    <ClCompile Include="..\engine\matsys_interface.cpp">
+      <Filter>sdk\engine</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\client\cdll_engine_int.h">
@@ -1862,6 +1865,12 @@
     <ClInclude Include="..\public\utility\sigcache.h">
       <Filter>sdk\public\utility</Filter>
     </ClInclude>
+    <ClInclude Include="..\public\imaterialsystem.h">
+      <Filter>sdk\public</Filter>
+    </ClInclude>
+    <ClInclude Include="..\engine\matsys_interface.h">
+      <Filter>sdk\engine</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <Image Include="..\shared\resource\lockedserver.png">