I got you beat there... I have a mini PC (used to be a terminal server client), that runs XP, and has a SW1000XG card in it... It's connected (well, not all the time...) via MIDI...
But, you're right, I think I saw a XG ins file but I wasn't at my DAW when I wrote the mail (still not actually...my boss likes it when I do some work for him too :)