i have a pc and my friend a mac so he cant edit .bic

since i had downloaded a couple of units, added them to civ3mod.bic and edited the unit_32.pcx, i zipped all that and sent it to my friend using mac

he backed up his files and placed mines instead, but now he cant open the game, it just crashes

why?

in the zip was : unit_32.pcx, civ3mod.bic, all the new units folder