Anyway to list available MMS streams on a server?

This is a long, long shot, but lemme ask...

Let's say that you know the base URL of the streaming server, something like

mms://wms.streaming.com

ASF/WMV streams are apparently organized by a simple directory structure, like:

mms://wms.streaming.com/sports/baseball07_500k.wmv

I'm guessing that there's no way to somehow get a listing of the directory from the server, right? After all it's like trying to list subdirectories on a webpage that has a index.htm in the root...