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  Browser and Preferences
  Please ensure that the "Preferences" settings (Netscape) and "Internet Options" settings (Internet Explorer) are set up to use Media Player and/or Real Player to view the various stream formats inlcluding .asf, .wma, .wmv, .asx (Windows Media Player) and .rm, .ram, .rpm, .smil (Real Player)

Note:
These settings are usually done automatically when the player is installed.