So I installed the twilight expansion, love the features in it, but when I start it up, says it can't find location of dread lords.  Re-installing the whole thing seems to have fixed whatever is wrong but it left me wondering

Is there some configuration file that keeps track of directories for GC2 and it's expansions?  I was thinking of moving the game to another partition on my hard drive.  Would I have to reinstall everything again?  takes a long wait to get through that.  Thanks in advance!