The file format (Nintendo Submission Package) used for installing games on modified consoles or emulators.
Use software like WinRAR or 7-Zip to extract the contents. You only need to extract part1 , and it will automatically pull from the other parts. NINO-KNIRK-PE-NSwTcH-[BASE]-NSP-Ziperto.part1.rar
Because this is labeled "part1", you will need all subsequent parts (part2, part3, etc.) located on the same site to extract the file correctly. The file format (Nintendo Submission Package) used for
Identifies this as the first part of a multi-part RAR archive hosted by Ziperto. Key Information & Usage Notes NINO-KNIRK-PE-NSwTcH-[BASE]-NSP-Ziperto.part1.rar
Represents the game title, which appears to be NinoKuni (Ni no Kuni) for the Nintendo Switch.