And I guess NT4/2000/2003 Server go under Windows XP....
Another remark about enabling the games: In the recently leaked build 0256, the directory where you can find the ConfigCache.xml file is
NOT your E-mail address (.NET Passport), but some random number. I don't know why they added these random number directories, they're weird.
Anyway, cheers to Mikey from Neowin!