With Windows Media® for QuickTime you can play Windows Media files (.wma and .wmv) directly in your QuickTime Player and view Windows Media content on the Internet using a Web browser.
Optimized for High-Definition Playback: Windows Media® Components for QuickTime has been highly optimized for Power Mac G4 and G5 computers and supports playback of high-definition Windows Media video files.
Requires Mac OS X version 10.3.9 or later