Visual Studio compiles some files every time (even when no changes are made)

I've been developing an application on VS2008 and everything went very well. I made some alterations, on the name of the solution and projects, and that's about when I started going crazy with the following behavior:

• I clean my solution;
• Every file is recompiled (normal up to here);
• I make no changes whatsoever in any file and VS compile a set of files again;
• Still with no changes made, the same files get recompiled every time.

If somebody has an idea of might be going on, that would be fant开发者_Go百科astic. If not, what kind of tests can I do to investigate this further?

Thanks

EDIT:

• The language used is C++ with CUDA extensions;
• The files being compiled every time are .cu files

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Probably those file had had file modification date in the future, and after you saved them their date became in the past.