Are .vcproj and .sln files still used in VS2012 or are they called something else now?

The reason I'm asking is that when I first moved from VC6 to VC8, it was quite handy to be able to have both the new style files (.vcproj / .sln) and the older files (.dsp / .dsw) in the same build folder. It meant that I could easily fall back to building with VC6 if necessary (although I don't think I ever needed to).

Now I want to upgrade to VS2012. Would my .vcproj and .sln files remain preserved or would they get converted to a newer format?