Could you specify what do you mean with "game format"?
CIA files you install directly to the 3DS system. 3ds files are for gateway/other 3ds flash cartsCIA Vs 3ds
CIA files you install directly to the 3DS system. 3ds files are for gateway/other 3ds flash carts
You install them and play them its that simple you will only get banned for cheating online or for playing a game online before its official release date.How do I play CIA files safely online?