Yes, XBMC will recognise data on a disc in standard format. I'm not totally sure the game will play but I don't see why not. I bung avi,bin,mpg ect files on a +RW all the time and xbmc sees them just fine.
I looked up "gormless" in the dictionary, it said "without gorm" .... so i looked up "gorm" but it wasn't there ????