The file you described is a , which is a standard format for digital Switch games.
If you intend to play this on a computer, you can use emulators like or Yuzu (though Yuzu development has ceased). You will need your console's prod.keys and title.keys to decrypt and run the game. Ducky Quacky [0100F59017AFA000][v0][US].nsp.rar
: A popular choice for managing and installing .nsp files directly on the console. The file you described is a , which
I can provide specific steps for either setup. The file you described is a