The default feed is available to media players that can perform protocol rollover between MMS, RTSP, and HTTP. (e.g. Windows Media Player and RealPlayer).
The latest version of Windows Media Player or a compatible player with the Windows Media coded is requred to play these files.
For Mac users, the latest version of QuickTime Player or iTunes should be able to decode and play these files without a problem. Consult documentation for these respective players or Apple for more details.
For Linux users, the latest version of the media player that came with your distribution of Linux should be able to decode and play these files without a problem. Consult the help documentation or MAN files for you respective players. For more information, to go the Linux website or to the respective website of your distribution.