cannot be opened because its project type (.csproj) is not supported by this version of the application.

Conversion of VS 2008 projects to VS 2010 projects

If we run any any VS 2008 project in VS 2010. We will face below issue. We can clear this issue by below procedure
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Microsoft Visual Studio
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'D:\Practise\Scheduler.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.
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OK   Help   
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For opening .csproj file we have to create old version of the VS, after that we have to run the devenv.exe. from visual studio command prompt we can do this work with skipLoading tags. 

 go to Start Menu -> All Programs ->  Microsoft Visual Studio 2010 -> Visual Studio Tools -> Visual Studio Command Prompt as administrator. run below command in the command prompt. 

Devenv.exe /ResetSkipPkgs

 It will open VS 2010. After that open your solution, you will get conversion wizard. 

happy coding in VS 2010