I extracted the cheat dat file to the cheats folder and tried to load up xmen. Nebula crashes before it can start the emulation. If I remove the xmencota.dat, the game plays fine, so its not an issue with my romset.
I'm using nebula 2.17, buty am unaware if the cheat engine went through any major overhauls which would cause the dat to crash the emu. The readme and site for the hack says to use v1.92 or newer, but I can't find any old versions of nebula to test it with. Anybody have some links to older versions or an old one to upload somewhere?