Right now it only works with saves that are 512KB and up (Mario Kart 7, Super Smash Bros., and Kid Icarus: Uprising work, for example), just use your personal dump of the game (since the headers need to match the save), with .3DZ as the file extension, and have the save file named (game's titleID).sav, for example Super Smash Bros. you'd call it "00040000000EDF00.sav". This also doesn't work for saves using the 6.0.0+ save encryption, so if a game with the 6.0.0+ saving was saved on 6.0.0 and higher (outside of Gateway's classic mode) it won't work with Gateway. This is because Gateway classic mode forces these games to use the older encryption.