Looking at it on my XP system, it looks like it's adding one handle per second. I'm guessing that it's actually one handle per packet exchange with the receiver.
Looking more closely (from memory, so excuse me if I get it wrong), the handles being leaked are for keys with a name something like "HKEY/.mp3"
Personally, I don't see how something that leaks this badly made it out the door. On the other hand, I regularly use a Name Brand web browser, so I guess Rio's in good company.