Since Windows by default don't show hidden files, I must say that most of my engineer coleagues would fall in the trick. Sadly, most people that I worked open the files manually.
Maybe because of the Control Panel revamp, or the fact that the menu-bar is hidden by default in Explorer windows?
I'm not sure which will look dumber as a consequence of this post: me or the Windows 7 UI.
attrib +h
at the cmd prompt, the file properties in explorer would have a checkbox for this too