Silverlight 4: Resolving Microsoft.Silverlight.CSharp.targets was not found?

Question

I\'ve been upgrading some Silverlight 3 apps to Silverlight 4 in Visual Studio 2010. My Silverlight 3 apps open fine in Visual Studio, but SL4 apps don\'t, with the followin

Answer 1

A previously working installation can break when you install a new version of TFS on the server (or whatever it was that messed with my MSBuild).

My 'targets' files had disappeared from C:\Program Files (x86)\MSBuild\Microsoft\Silverlight\v5.0 on Server 2012 and reinstalling the tools.

I believe it may be possible to just copy the targets files from another machine but not 100% sure.