Well, after 1.31 hit my maps remained where they were on a drive in warcfat III/maps. But I think in order to make them show up in game you need to put your map into documents/warcraft III/maps which is entirely stupid because document in my case located on my ssd which is a system drive and has only 256 gb insted of my non-system hdd where my game folder is 1000 gb and I try to keep it as clean as possible but blizz forces me to keep maps there.