'C:\xxx.csproj' cannot be opened because its project type (.csproj) is not supported by this version of the application. To open it, please use a version that supports this type of project.
Follow the below steps to resolve the above error. Click Start> All Programs > Visual Studio 2008 > Visual Studio Tools > Click Visual Studio 2008 Command Prompt. Type the below command and press enter.
devenv.exe /resetskippkgs
Executing this command should solve your problem.
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