It seems that there is just a bit of confusion here, and I guess it's somewhat understandable.
From the wiki...
In reply to:
All of our hosting packages support HTTP streaming media (also known as Progressive Download).... To set up HTTP streaming on your account you first need to make your file. Start by compressing your file into a suitable format. WMA,WMV, RM, MP3, etc....
In reply to:
To stream for Windows Media Player save as a .wma for audio or a .wmv for video files. and link to them from your web site. The latest versions of Media Player (http://www.microsoft.com/windows/windowsmedia/player/download/download.aspx) will automatically stream these files.
The above two sections are specifically talking about streaming through progressive downloading. It's a technology that only requires a compatible media player, not a specific streaming server. You can stream via progressive download from ANY web accessible directory.
As you have seen, the Darwin streaming server does not support *.wmv. Here is a link to details about Darwin: http://www.publicsource.apple.com/projects/streaming/StreamingServerHelp/pgs/ss12.html
I did a lot of research about this stuff the other night, because I was hoping to use Darwin as a relay server. I wanted to upload a single stream from winamp on my machine to Darwin, then have a couple live streams for friends, ala SHOUTcast. No luck in my research so far.
http://benconley.net
http://teamshocker.com