Nintendo DS releases are in their native ROM format (.neo or .nds). The Scene has been doing .zip from the GBA days, but now the releases need to be compressed into 5 MB split RAR volumes and contain a Nintendo DS title or a patch for a Nintendo DS title. Also an NFO file is a must. A patch is some modification or tool like a trainer, crack, language selector or save fix. The most common formats are .BDF and .IPS. The directory name must include the text "NDS" and the group name. DSi related releases are regarded as NDS releases and must have the tag DSi.