Does anyone know how to play a user-made-map on hotseat? Some have suggested there are some files that could be edited or something. I really want to play an earth map with 2 people in hotseat. Any ideas gents?

Does anyone know how to play a user-made-map on hotseat? Some have suggested there are some files that could be edited or something. I really want to play an earth map with 2 people in hotseat. Any ideas gents?
We can only send thousands of mails to Firaxis about this problem, because looks like they don't care about people, who bought Civ4 for hotseat :mad: