Recoil... tank shooter, by Zipper (published by Westwood)... fun game back when it came out. Used Westwood Online. And it does run on this thing, though it isn't mentioned anywhere on this site as far as I could find and its chat channel in WOL/XCC is misnamed (like it says "D2k: 2, RA1: 3, 17: 1, WC: 1" or something... the others are obvious, but "17" is Recoil...), and I doubt anyone has actually tried to play it in years, but it DOES work.

Are there other unmentioned games that XCC supports?