In another example of Windows 7 moving towards hiding controls for things in absurd, removed locations, I could not f*$#&$g figure out how to turn on file extensions for a new Windows 7 system. Asking the question on Google came up with thousands and thousands of hits of other people asking the same question. This page described how to excavate the show folder options dialog far more clearly than I could, and with less rage-driven flecks of spittle:
http://askabouttech.com/how-to-show-file-extension-in-windows-7/