diff --git a/build/vs/vs.vcxproj b/build/vs/vs.vcxproj
index 8b56c5c..2f3f095 100644
--- a/build/vs/vs.vcxproj
+++ b/build/vs/vs.vcxproj
@@ -76,6 +76,9 @@ xcopy /s /e /d /y "..\..\data" "$(OutDir)data\"</Command>
     </Link>
   </ItemDefinitionGroup>
   <ItemGroup>
+    <ClCompile Include="..\..\src\checksum.cpp" />
+    <ClCompile Include="..\..\src\Core.cpp" />
+    <ClCompile Include="..\..\src\fio.cpp" />
     <ClCompile Include="..\..\src\Log.cpp" />
     <ClCompile Include="..\..\src\main.cpp" />
     <ClCompile Include="..\..\src\Mat4.cpp" />
@@ -104,7 +107,10 @@ xcopy /s /e /d /y "..\..\data" "$(OutDir)data\"</Command>
     <None Include="..\..\data\shaders\fb_vs.glsl" />
   </ItemGroup>
   <ItemGroup>
+    <ClInclude Include="..\..\src\checksum.hpp" />
     <ClInclude Include="..\..\src\common.hpp" />
+    <ClInclude Include="..\..\src\Core.hpp" />
+    <ClInclude Include="..\..\src\fio.hpp" />
     <ClInclude Include="..\..\src\Log.hpp" />
     <ClInclude Include="..\..\src\Mat4.hpp" />
     <ClInclude Include="..\..\src\Mesh.hpp" />
diff --git a/build/vs/vs.vcxproj.filters b/build/vs/vs.vcxproj.filters
index f1a5393..76bf59a 100644
--- a/build/vs/vs.vcxproj.filters
+++ b/build/vs/vs.vcxproj.filters
@@ -63,6 +63,15 @@
     <ClCompile Include="..\..\src\Quat.cpp">
       <Filter>Classes</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\src\Core.cpp">
+      <Filter>Classes</Filter>
+    </ClCompile>
+    <ClCompile Include="..\..\src\checksum.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\..\src\fio.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <None Include="..\..\..\..\Dev\SDL2-2.0.3\lib\x86\SDL2.dll">
@@ -121,5 +130,14 @@
     <ClInclude Include="..\..\src\Quat.hpp">
       <Filter>Classes</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\src\Core.hpp">
+      <Filter>Classes</Filter>
+    </ClInclude>
+    <ClInclude Include="..\..\src\checksum.hpp">
+      <Filter>Source Files</Filter>
+    </ClInclude>
+    <ClInclude Include="..\..\src\fio.hpp">
+      <Filter>Source Files</Filter>
+    </ClInclude>
   </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/src/checksum.hpp b/src/checksum.hpp
index 67d08bf..c9a6e01 100644
--- a/src/checksum.hpp
+++ b/src/checksum.hpp
@@ -5,7 +5,13 @@ checksum.cpp/checksum.hpp provide functionality for checking and generating chec
 ================================================================ */
 #ifndef CHECKSUM_HPP
 #define CHECKSUM_HPP
+// FIXME: is this really okay?
+#ifdef _WIN32
+typedef unsigned __int32 uint32_t;
+typedef unsigned __int8 uint8_t;
+#else
 #include <inttypes.h>
+#endif
 #include <stdio.h>
 uint32_t crc32(uint32_t crc, const char *buf, size_t len);