diff --git a/builds/msvc/vs2010/libsodium/libsodium.vcxproj.filters b/builds/msvc/vs2010/libsodium/libsodium.vcxproj.filters
index 8beab140..b8283a71 100644
--- a/builds/msvc/vs2010/libsodium/libsodium.vcxproj.filters
+++ b/builds/msvc/vs2010/libsodium/libsodium.vcxproj.filters
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="12.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup>
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_stream\aes256estream\hongjun\aes256-ctr.c">
       <Filter>src</Filter>
@@ -545,9 +545,6 @@
     <None Include="..\..\..\..\packaging\nuget\package.bat">
       <Filter>packaging</Filter>
     </None>
-    <None Include="..\..\..\..\packaging\nuget\package.config">
-      <Filter>packaging</Filter>
-    </None>
     <None Include="..\..\..\..\packaging\nuget\package.gsl">
       <Filter>packaging</Filter>
     </None>
@@ -557,6 +554,9 @@
     <None Include="..\..\..\..\packaging\nuget\package.targets">
       <Filter>packaging</Filter>
     </None>
+    <None Include="..\..\..\..\packaging\nuget\package.config">
+      <Filter>packaging</Filter>
+    </None>
   </ItemGroup>
   <ItemGroup>
     <Filter Include="src">
diff --git a/builds/msvc/vs2010/test/test.vcxproj.filters b/builds/msvc/vs2010/test/test.vcxproj.filters
index a58b55c5..e959e04d 100644
--- a/builds/msvc/vs2010/test/test.vcxproj.filters
+++ b/builds/msvc/vs2010/test/test.vcxproj.filters
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="12.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup>
     <ClCompile Include="..\..\..\..\test\default\auth.c">
       <Filter>src</Filter>
diff --git a/builds/msvc/vs2012/libsodium/libsodium.vcxproj.filters b/builds/msvc/vs2012/libsodium/libsodium.vcxproj.filters
index 8beab140..b8283a71 100644
--- a/builds/msvc/vs2012/libsodium/libsodium.vcxproj.filters
+++ b/builds/msvc/vs2012/libsodium/libsodium.vcxproj.filters
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="12.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup>
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_stream\aes256estream\hongjun\aes256-ctr.c">
       <Filter>src</Filter>
@@ -545,9 +545,6 @@
     <None Include="..\..\..\..\packaging\nuget\package.bat">
       <Filter>packaging</Filter>
     </None>
-    <None Include="..\..\..\..\packaging\nuget\package.config">
-      <Filter>packaging</Filter>
-    </None>
     <None Include="..\..\..\..\packaging\nuget\package.gsl">
       <Filter>packaging</Filter>
     </None>
@@ -557,6 +554,9 @@
     <None Include="..\..\..\..\packaging\nuget\package.targets">
       <Filter>packaging</Filter>
     </None>
+    <None Include="..\..\..\..\packaging\nuget\package.config">
+      <Filter>packaging</Filter>
+    </None>
   </ItemGroup>
   <ItemGroup>
     <Filter Include="src">
diff --git a/builds/msvc/vs2012/test/test.vcxproj.filters b/builds/msvc/vs2012/test/test.vcxproj.filters
index a58b55c5..e959e04d 100644
--- a/builds/msvc/vs2012/test/test.vcxproj.filters
+++ b/builds/msvc/vs2012/test/test.vcxproj.filters
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="12.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup>
     <ClCompile Include="..\..\..\..\test\default\auth.c">
       <Filter>src</Filter>
diff --git a/builds/msvc/vs2013/libsodium/libsodium.vcxproj.filters b/builds/msvc/vs2013/libsodium/libsodium.vcxproj.filters
index 8beab140..b8283a71 100644
--- a/builds/msvc/vs2013/libsodium/libsodium.vcxproj.filters
+++ b/builds/msvc/vs2013/libsodium/libsodium.vcxproj.filters
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="12.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup>
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_stream\aes256estream\hongjun\aes256-ctr.c">
       <Filter>src</Filter>
@@ -545,9 +545,6 @@
     <None Include="..\..\..\..\packaging\nuget\package.bat">
       <Filter>packaging</Filter>
     </None>
-    <None Include="..\..\..\..\packaging\nuget\package.config">
-      <Filter>packaging</Filter>
-    </None>
     <None Include="..\..\..\..\packaging\nuget\package.gsl">
       <Filter>packaging</Filter>
     </None>
@@ -557,6 +554,9 @@
     <None Include="..\..\..\..\packaging\nuget\package.targets">
       <Filter>packaging</Filter>
     </None>
+    <None Include="..\..\..\..\packaging\nuget\package.config">
+      <Filter>packaging</Filter>
+    </None>
   </ItemGroup>
   <ItemGroup>
     <Filter Include="src">
diff --git a/builds/msvc/vs2013/test/test.vcxproj.filters b/builds/msvc/vs2013/test/test.vcxproj.filters
index a58b55c5..e959e04d 100644
--- a/builds/msvc/vs2013/test/test.vcxproj.filters
+++ b/builds/msvc/vs2013/test/test.vcxproj.filters
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="12.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup>
     <ClCompile Include="..\..\..\..\test\default\auth.c">
       <Filter>src</Filter>