For those using Rio(Dell) Receivers and XP,
xPLRioNet is really a slick solution. Give it a try!
More in this thread too. At first I was leary of this post, as it seemed like some kind of self-serving plug to proclaim an app you're involved in as excellent, but I must agree! Once I got my head around some IP configuration issues, it was easy to install, seems to overcome server limitations, and appears to be flush with other capabilities. I really like the web-based control of the players, too. Great job to those who put this together!