getOrvillized

I am running Generals Zero Hour on an iMac. There's a list for custom maps in the game just like there is in the PC version of the game. But I cannot seem to find out which directory to put the map files in that works to save my life! I've looked high and low on the Internet for how to do this to no avail. Can someone please tell me how to load custom maps in the Mac version of the game? This is one thing I really miss from the PC version. I would be very grateful to know the answer. Also, I hear there is no map editor for the Mac. Is this true?