I tried it with the free Windows Media Connect from Microsoft.
It worked - but I had a couple of issues and I didn't find configurtin option to get around hem:
a) Windows Media Connect treats .mp2 files as video ... but are audio recordings from digital sources here. Since MediaSreamer doesn't play video yet, so they don't appear. (At least I assume that is the reason)
b) Can't see files mounted through mapped drive on a remote file server. Does UPnP tell the ckient where the files are rather han proxying them? If it does then I presume that MediaStreamer can not access folders via UNC.