Anyone know about rtsp protocol??

First of all, I'm running Mozilla-1.4rc1 on SuSE 8.2. Using Mozilla, I'm trying to access a live stream from GUA4DEC. Currently, there is no stream available. However, when there is, I am unable to access it. The link is: rtsp://193.1.31.232:554/broadcast/live.rm I'm able to access other Real media. When I try to access this, I get the following message: rtsp is not a registered protocol This would seem like a protocol of which Mozilla is unaware. My question is, how can I "register" this protocol with Mozilla? Any help is greatly appreciated. Rick