mms://

Eacht time a try to watch a clip that starts with
(mms://), this message appears: Windows Media Player
cannot play the file because the specified protocol is
not supported. In the Open URL dialog, try opening the
file using a different transport protocol (for
example, "http:" or "rtsp:").

i used to be able to watch them.. why the sudden change?
i hope to hear from somewhen.. thanks in advance!