A lot of video (and some audio) files found on the Internet are created by or formatted for the Windows Media Player. Microsoft no longer makes a version for Mac users. So how can you open and view these? There’s a free third-party plug-in that works with Apple’s QuickTime that allows Mac owners to open Windows Media files. It’s called Flip4Mac WMV and it’s available at Microsoft’s website.
This will allow you to open most WMV and WMA format audio and video files up to version 9 of Windows Media. There is currently no support for Windows Media 10, but with QuickTime quickly becoming the industry standard, that’s probably not a problem. Flip4Mac WMV requires OS X 10.3.9 or higher and QuickTime 6.5 or higher.