Tired of trying to open your media files in a variety of players only to suffer from incompatibility and versioning issues? Video Lan Client (or VLC) is the most universal player I've found. In my tests, I opened Windows-formatted media files on my Mac with surprising success. I also see greater compatibility on the Windows side as well (plus an easier-to-use interface than Windows Media Player). If your Web video experience seems incomplete, or you are looking for another app to test your media files before distribution, be sure to check this one out. You can open and view pretty much any form of audio or video on both a Mac or a PC (or any flavor of Linux for that matter).