if the map was created with GALAXY FORGE then the map should be in
C:\Program Files\Stardock Games\Sins of a Solar Empire\Galaxy for 32bit windows  and
C:\Program Files (x86)\Stardock Games\Sins of a Solar Empire\Galaxy for 64bit windows

if the map was created in the map designer in sins then it should be in the hidden folders
C:\Documents and Settings\"user name"\Local Settings\Application Data\Ironclad Games\Sins of a Solar Empire\Galaxy for xp and
C:\users\"user name"\Local Settings\Application Data\Ironclad Games\Sins of a Solar Empire\Galaxy for vista & w7

these locations are the locations that are used for maps created the two different ways, and note that the folders in the doucments & settings/users path ARE HIDDEN so you NEED to disable hide hidden fiels & folders in the tools/folder options

hope this helps

harpo