I was disappointed that Realplayer 10 wouldn't play this RealAudio stream I made several years ago, using official Real-branded tools as I recall. Instead, the message returned is:
The content you are trying to play uses an audio codec that is obsolete and no longer supported. Please contact the content provider about using a supported codec.
It appears Real quit supporting their own format. However, the open source totem player had no problem with it.
It's unfortunate when properiety vendors abandon their own formats, but this is a case when there is an option to upgrade to an open source solution.