Windows Media formats are supported in many software and hardware-based
players as well as Microsoft's own software-based Windows Media Player.
The foundation container format for Windows Media is the Advanced
Systems Format file, which holds audio, video, meta-data indexes and scripts. Windows Media audio and video files can be downloaded intact and
played, or they can be streamed from a Web site when used in
conjunction with Microsoft's Windows Media Services on a Web server.
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Roger
MLS