.ogg is the filetype for the -music- in the game, but I haven't tested the conversion myself, so all bets are off on that idea.
Oh and, using ambience is just a setting in the ZoneInfo, with a list to pick from, has nothing to do with importing/replacing.
Oh and, using ambience is just a setting in the ZoneInfo, with a list to pick from, has nothing to do with importing/replacing.