Well then, have you deleted it?
If so, just re-install, or repair the game via your game disc or just copy over that file from the other system.
So are you sure that file is missing? Cause IMO it also consists of some main game settings and stuff, so if it is deleted, the game would create it again on RUN TIME.
Well the probability of it to be hidden is 0 IMHO.
Have you tried looking into your savegame directory? There is a possibility for it to be present there.