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I'm trying to create a filtered item group from another one, where the filtered item group will only contain items from the first group that have a specified file extension. I'm getting the following error: error MSB4190: The reference to the built-in metadata "Extension" at position 1 is not allowed in this condition "'%(Extension)'=='.sys'". When I run this: <?xml version="1.0" encoding="utf-8"?> <Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003" DefaultTargets="Go" ToolsVersion="4.0"> <ItemGroup> <Files Include="X.exe"/> <Files Include="Y.sys"/> </ItemGroup> <ItemGroup> <SysFiles Include="%(Files.Identity)" Condition="'%(Extension)'=='.sys'"> </SysFiles> </ItemGroup> <Target Name="Go"> <Message Text="SysFiles=@(SysFiles)"/> </Target> </Project> Firstly, I can't understand why the meta data isn't allowed at this position? Is it some artificial restriction or unimplemented part of msbuild? Secondly, what's a concise way of achieving this kind of transform? Thanks very much.

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