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If you are delivering content as a multicast stream through a Windows Media server, you must create an announcement (.asx) and multicast information (.nsc) file. You must have access permission to the Windows Media server service through DCOM in order to create the files on the encoding computer. If this is not the case, the files can be created on the server.
If you are delivering content as a unicast stream through a Windows Media server, it is not necessary to create an announcement.