Couldn't upgrade this project, not sure why it's needed?

spine-csharp/spine-csharp_xna.csproj

@@ -1,140 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
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-    <RootNamespace>spine_csharp_xna</RootNamespace>
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-    <Reference Include="System.Net">
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-  <ItemGroup>
-    <Compile Include="Properties\AssemblyInfo.cs" />
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-    <Compile Include="src\AnimationState.cs" />
-    <Compile Include="src\AnimationStateData.cs" />
-    <Compile Include="src\Atlas.cs" />
-    <Compile Include="src\Attachments\AtlasAttachmentLoader.cs" />
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-  <Import Project="$(MSBuildExtensionsPath)\Microsoft\XNA Game Studio\Microsoft.Xna.GameStudio.targets" />
-  <!--
-      To modify your build process, add your task inside one of the targets below and uncomment it. 
-      Other similar extension points exist, see Microsoft.Common.targets.
-      <Target Name="BeforeBuild">
-      </Target>
-      <Target Name="AfterBuild">
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