Microsoft has updated Windows Media Components for QuickTime under Mac OS X

With Windows Media Components for QuickTime, by Flip4Mac you can play Windows Media files (.wma and .wmv) directly in 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 and Intel computers and supports playback of high-definition Windows Media video files.

Upgrade to Advanced Features:
Windows Media playback is provided for free. By upgrading, you can import Windows Media files for editing and create Windows Media files for distribution. To learn more about these advanced features, visit the Flip4Mac Web site.

Windows Media Components for QuickTime