As stated what in the world is it? the mt-card folks act like it's an online supporting 3ds rom yet I can't see what else it is beyond that nor why it ends with the z letter, as that's normally what's used to say that a file is compressed with deflate(zip) so what's going on there? I'm still not ready to get a card yet and am pretty much going to get an mt-card as I don't trust gateway but that makes zero sense to me.