I had my 3ds connected to my computer via wifi and can access the sd card, but no where can I find the save data. Do the save files have a .sav extension? When I can access the sd card the only files I see are files ending with a .app or .cmp extension. The save file I'm trying to transfer is from SMT IV:apocalypse, retail. The game gives you one save file on the game cartridge and the rest of your save slots are saved on the sd card so I'm thinking the save file should be on the sd card.