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PTVS 2.2.2 (https://github.com/Microsoft/PTVS/releases/v2.2.2 - last release of PTVS for Visual Studio 2013) requires conversion projects:

diff --git a/test/scripts/pykdtest.pyproj b/test/scripts/pykdtest.pyproj
index 61f3761..4aed836 100644
--- a/test/scripts/pykdtest.pyproj
+++ b/test/scripts/pykdtest.pyproj
@@ -30,6 +30,10 @@
     <DebugSymbols>true</DebugSymbols>
     <EnableUnmanagedDebugging>false</EnableUnmanagedDebugging>
   </PropertyGroup>
+  <PropertyGroup>
+    <VisualStudioVersion Condition="'$(VisualStudioVersion)' == ''">10.0</VisualStudioVersion>
+    <PtvsTargetsFile>$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)\Python Tools\Microsoft.PythonTools.targets</PtvsTargetsFile>
+  </PropertyGroup>
   <ItemGroup>
     <Compile Include="basetest.py" />
     <Compile Include="breakpoint.py" />
@@ -62,5 +66,6 @@
     <InterpreterReference Include="{2af0f10d-7135-4994-9156-5d01c9c11b7e}\2.7" />
     <InterpreterReference Include="{9a7a9026-48c1-4688-9d5d-e5699d47d074}\2.7" />
   </ItemGroup>
-  <Import Project="$(MSBuildToolsPath)\Microsoft.Common.targets" />
+  <Import Project="$(PtvsTargetsFile)" Condition="Exists($(PtvsTargetsFile))" />
+  <Import Project="$(MSBuildToolsPath)\Microsoft.Common.targets" Condition="!Exists($(PtvsTargetsFile))" />
 </Project>

Are there any reasons to use older versions?