The HTTP Download Plug-in
When you specify the httpd:// prefix to connect to a Web server and request a playlist, the Windows Media server uses the WMS HTTP Download Data Source plug-in to download the playlist.
Note
If you are downloading a playlist from a Web server that sends an authentication challenge, you must specify a user name and password by using the IWMSPublishingPoint.SetDistributionUserNamePasswordIWMSPublishingPoint.SetDistributionUserNamePassword (Visual Basic .NET).
After the playlist has been downloaded, the server parses it by using a playlist parser plug-in. If the playlist uses SMIL 2.0, the server uses the playlist parser plug-in for which the Input Format property equals IID_IWMSPlaylistSmilFormat (C34294EA-E111-4FB2-BE6B-EC686A1A9757). Normally, the server uses the WMS SMIL Playlist Parser plug-in. However, if the playlist does not use the SMIL format, you must create a plug-in to parse it, and the server searches through the custom plug-ins until it finds one that can create a playlist object from the downloaded playlist. For more information, see Creating Playlist Parser Plug-ins.
Note
For more information about the SMIL 2.0 Specification, W3C Recommendation, see the W3C Web site.
Web addresses can change, so you might be unable to connect to the Web site or sites mentioned here.