It seems that the HTTPListener class in .NET 2.0 does not support custom URIs as I once thought. I only supports the http:// and http:// prefixes. I'm still investigating, but it looks like I might end up writing my own custom server just so that I can do something like psvn://  Is that crazy or what? At least I have enough experience now writting tcp servers. Is TCPListener in my future? Time will tell...