Hi wiilobo,
I think that this link could be interesting:
http://www.afterdawn.com/guides/archive/stream_tvants_video_to_nintendo_wii.cfm
In the first page you can see how to get the name of file which is played. Add it in onlinemedia.xml and good luck!
Obviously you must change localhost with your pc ip address. Unluckly the file name is not always the same, so you’ll must edit the xml every time you play a new stream.
Tell me if it works.
denper