I can't open WMV's or AVI's on my Mac. I have VLC, Flip4Mac, DivX Players and MPlayer OSX 2 all downloaded and usually I don't have a problem. However, I keep getting a message now when I try to open a WMV or AVI that "The movie is not in a format that Quicktime player understands- you may need to install additional software to open this type of file." not matter which player I try to open it with. My software for my MPB is all current and up to date. What is the problem? Can anyone please help me ???