diff --git a/Mkfiles/vc10/genperf/genperf.vcxproj b/Mkfiles/vc10/genperf/genperf.vcxproj
index 3ca1fb45..b94d5a2b 100644
--- a/Mkfiles/vc10/genperf/genperf.vcxproj
+++ b/Mkfiles/vc10/genperf/genperf.vcxproj
@@ -44,6 +44,10 @@
     <OutDir Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">$(Platform)\$(Configuration)\</OutDir>
     <IntDir Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">$(Platform)\$(Configuration)\</IntDir>
     <LinkIncremental Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">false</LinkIncremental>
+    <PreBuildEventUseInBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">false</PreBuildEventUseInBuild>
+    <PreBuildEventUseInBuild Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">false</PreBuildEventUseInBuild>
+    <PreLinkEventUseInBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">false</PreLinkEventUseInBuild>
+    <PreLinkEventUseInBuild Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">false</PreLinkEventUseInBuild>
   </PropertyGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <ClCompile>
diff --git a/Mkfiles/vc10/genperf/run.bat b/Mkfiles/vc10/genperf/run.bat
index 9c22b57e..5827138b 100644
--- a/Mkfiles/vc10/genperf/run.bat
+++ b/Mkfiles/vc10/genperf/run.bat
@@ -16,7 +16,13 @@ call %_python_% modules\arch\x86\gen_x86_insn.py
 
 :therest
 @echo on
-%1 x86insn_nasm.gperf x86insn_nasm.c
-%1 x86insn_gas.gperf x86insn_gas.c
-%1 modules\arch\x86\x86cpu.gperf x86cpu.c
-%1 modules\arch\x86\x86regtmod.gperf x86regtmod.c
+call :update %1 x86insn_nasm.gperf x86insn_nasm.c
+call :update %1 x86insn_gas.gperf x86insn_gas.c
+call :update %1 modules\arch\x86\x86cpu.gperf x86cpu.c
+call :update %1 modules\arch\x86\x86regtmod.gperf x86regtmod.c
+goto :eof
+
+:update
+%1 %2 tf
+call mkfiles\vc10\out_copy_rename tf .\ %3
+del tf
diff --git a/Mkfiles/vc10/libyasm/libyasm.vcxproj b/Mkfiles/vc10/libyasm/libyasm.vcxproj
index a480d2a6..af67e44d 100644
--- a/Mkfiles/vc10/libyasm/libyasm.vcxproj
+++ b/Mkfiles/vc10/libyasm/libyasm.vcxproj
@@ -229,15 +229,12 @@
     <ClInclude Include="..\..\..\libyasm\file.h" />
     <ClInclude Include="..\..\..\libyasm\arch.h" />
     <ClInclude Include="..\..\..\libyasm\assocdat.h" />
-    <ClInclude Include="..\..\..\libyasm\bc-int.h" />
     <ClInclude Include="..\..\..\libyasm\bitvect.h" />
     <ClInclude Include="..\..\..\libyasm\bytecode.h" />
     <ClInclude Include="..\..\..\libyasm\compat-queue.h" />
-    <ClInclude Include="config.h" />
     <ClInclude Include="..\..\..\libyasm\coretype.h" />
     <ClInclude Include="..\..\..\libyasm\dbgfmt.h" />
     <ClInclude Include="..\..\..\libyasm\errwarn.h" />
-    <ClInclude Include="..\..\..\libyasm\expr-int.h" />
     <ClInclude Include="..\..\..\libyasm\expr.h" />
     <ClInclude Include="..\..\..\libyasm\floatnum.h" />
     <ClInclude Include="..\..\..\libyasm\hamt.h" />
@@ -252,7 +249,6 @@
     <ClInclude Include="..\..\..\libyasm\preproc.h" />
     <ClInclude Include="..\..\..\libyasm\section.h" />
     <ClInclude Include="..\..\..\libyasm\symrec.h" />
-    <ClInclude Include="..\..\..\libyasm\util.h" />
     <ClInclude Include="..\..\..\libyasm\valparam.h" />
     <ClInclude Include="..\..\..\libyasm\value.h" />
   </ItemGroup>
diff --git a/Mkfiles/vc10/libyasm/libyasm.vcxproj.filters b/Mkfiles/vc10/libyasm/libyasm.vcxproj.filters
index aaad93d7..6385583d 100644
--- a/Mkfiles/vc10/libyasm/libyasm.vcxproj.filters
+++ b/Mkfiles/vc10/libyasm/libyasm.vcxproj.filters
@@ -106,9 +106,6 @@
     <ClInclude Include="..\..\..\libyasm\assocdat.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\..\libyasm\bc-int.h">
-      <Filter>Header Files</Filter>
-    </ClInclude>
     <ClInclude Include="..\..\..\libyasm\bitvect.h">
       <Filter>Header Files</Filter>
     </ClInclude>
@@ -127,9 +124,6 @@
     <ClInclude Include="..\..\..\libyasm\errwarn.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\..\libyasm\expr-int.h">
-      <Filter>Header Files</Filter>
-    </ClInclude>
     <ClInclude Include="..\..\..\libyasm\expr.h">
       <Filter>Header Files</Filter>
     </ClInclude>
@@ -175,18 +169,12 @@
     <ClInclude Include="..\..\..\libyasm\symrec.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\..\libyasm\util.h">
-      <Filter>Header Files</Filter>
-    </ClInclude>
     <ClInclude Include="..\..\..\libyasm\valparam.h">
       <Filter>Header Files</Filter>
     </ClInclude>
     <ClInclude Include="..\..\..\libyasm\value.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="config.h">
-      <Filter>Header Files</Filter>
-    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <None Include="..\..\..\libyasm\module.in" />
diff --git a/Mkfiles/vc10/out_copy_rename.bat b/Mkfiles/vc10/out_copy_rename.bat
new file mode 100644
index 00000000..349ee330
--- /dev/null
+++ b/Mkfiles/vc10/out_copy_rename.bat
@@ -0,0 +1,42 @@
+@echo off
+if not exist %1 goto nofile
+if exist %2 goto copy
+
+echo creating directory %2
+md %2 > nul
+
+:copy
+set str=%2
+for /f "useback tokens=*" %%a in ('%str%') do set str=%%~a
+set str=%str:~-1%
+if %str% == "\" goto hasbackslash
+
+if not exist %2\%3 goto cpy
+fc %1 %2\%3 > nul && if not %errorlevel 1 goto exit
+echo overwriting %2\%3 with %1
+copy %1 %2\%3 > nul
+goto exit
+
+:cpy
+echo copying %1 to %2\%3
+copy %1 %2\%3 > nul
+goto exit
+
+:hasbackslash
+if not exist %2%3 goto cpy2 
+fc %1 %2%3 > nul && if not %errorlevel 1 goto exit
+echo overwriting %2%3 with %1
+copy %1 %2%3 > nul
+goto exit
+
+:cpy2
+echo copying %1 to %2%3
+copy %1 %2%3 > nul
+goto exit
+
+:nofile
+echo %1 not found
+
+:exit
+
+
diff --git a/Mkfiles/vc10/vsyasm.vcxproj b/Mkfiles/vc10/vsyasm.vcxproj
index 7decc5bc..0c6e22a2 100644
--- a/Mkfiles/vc10/vsyasm.vcxproj
+++ b/Mkfiles/vc10/vsyasm.vcxproj
@@ -251,9 +251,6 @@
     <ClCompile Include="..\..\frontends\vsyasm\vsyasm.c" />
     <ClCompile Include="..\..\frontends\yasm\yasm-options.c" />
   </ItemGroup>
-  <ItemGroup>
-    <ClInclude Include="..\..\frontends\vsyasm\yasm-options.h" />
-  </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="libyasm\libyasm.vcxproj">
       <Project>{29fe7874-1256-4ad6-b889-68e399dc9608}</Project>
@@ -264,6 +261,9 @@
       <ReferenceOutputAssembly>false</ReferenceOutputAssembly>
     </ProjectReference>
   </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="..\..\frontends\yasm\yasm-options.h" />
+  </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
   </ImportGroup>