Windows XP only supports UEFI because of some excellent hacks[1]. Haven't seen anything for NT or 2k beyond some preliminary testing[2].
[1]https://msfn.org/board/topic/186793-csmwrap-boot-csm-on-uefi...
[2]https://msfn.org/board/topic/183745-is-it-possible-to-boot-w...