Microsoft stopped development of the Windows Media Player for MacOS X years ago. It now recommends Telestream's Flip4Mac WMV QuickTime codec. However, this will likely not allow you to play .avi video. Most .avi video files are DivX-based. I strongly recommend that you download and install the DivX codec. You may also download and install the Perian codec suite to handle virtually every video format extant.so here is a screen shot of the error i get...trying to install windows media player...cuz this .avi movie i have said to install it! thx