I've tried the "EnableRemoteContentSharing" registry edit in both versions 11 and 12 of WMP, and it only seems to work with 11 (in Vista Ultimate, if that matters). In Windows 7 running WMP 12, I cannot for the life of me get network shares in my Windows Media Library to share with my other computers on my network. I've googled quite a bit and only come up with copies all over the Internet of the same Microsoft KB article about the aforementioned registry edit.