Visual Studio – The project type is not supported by this installation

Check ‘ProjectTypeGuids’ in .csproj file, to see which project type (GUID) may not be supported.
In my case I had MVC3 installed with Visual Studio Express. Later I got Visual Studio Ultimate and MVC3 was not supported by default. Installing MVC3 once again solved the problem.

Helpful sources:
Stack Overflow – GUIDS
SharePoint Space – edit GUID values
Dev Help – Project Type GUIDs

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