I have both a Mac and a PC. I have a bunch of Mac CD's that have clip art (eps) and sound (aif) files on them. Since they are Mac files they do not have extensions on them. I can open them up on my PC, but I have to open the App. and drag the files onto the App. (i.e. I can't double click them). This isn't a big deal, but I was wondering if there is a way to universally add an extension (i.e. ".wav" ) to a folder full of files?