Visual Studio 2008: Conversion wizard every time I open the project

Question

I've tried to convert a VS2008 solution to VS2010, but it didn't really work. So I wanted to change the solution back to VS2008.

I've reverted all the files to their original state (with subversion) and it seems to work well, but every time I open the project the conversion wizard is "updating" my solution to VS2008, which is annoying.

Other than that everything works fine.

Any ideas how to open it without the wizard showing up every time ?

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Edit:

I've checked out another copy of the project - and this seems to work fine. "Dialecticus" wrote me to delete all ncb, opt and user files. I just had .user files but deleting them didn't help. After that I've deleted the working copy and checked out another version - now it works fine.

Answer 1

Maybe some of the unversioned files is causing this behavior. Checkout another copy of repository and see if the problem occurs. Usual suspect files: .ncb, .suo, .user.

Answer 2

Tools -> Options -> Office Tools -> Project Upgrade

Try clearing the option Always upgrade to the installed version of Office.