God bless you! I've been searching it for my Citra Emulator to play the World 9. Most of the save file web resources give you an encrypted. sav file which is not compatible with Citra + they aren't the same size and changing the extension name didn't help at all. The game just didn't recognize it as a legitimate save. Your slot0.dat has suited perfectly for my slot0.dat. I've spent so much time searching for it.