DotNetOpenAuth MVC samples - project type not supported

I have an issue with the DotNetOpenAuth sample projects. I have Visual Studio 2008, with MVC1 installed, yet when i try open the samples.sln the 2 MVC projects fail to load, giving the error:

"Project type not 开发者_如何学运维supported"

Is there additional requirements other than VS an MVC?

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Ok after posting that question i found a general answer on another SO question that worked for me in this specific case.

Changing the GUID's in the project file allowed teh projects to be loaded as part of the solution. No idea why - don't care cos it works :)

Just posted this answer in case someone else has the issue in DotnetOpenAuth.