Custom maps for PBEMs

[ForesterSOF]

I have made an imposible map using atlas and can load it for single player if start the game by clicking on the imposible.C4 file.

My problem is where to put the file so I can make a PBEM using it or any other map I make.

I tried putting the map with the other C4s but still was given only the original maps.

What I need is the option to use a custom map when creating a game.

Any Ideas.

Frustrated