NSP (Nintendo Submission Package), which is the standard format for digital Switch eShop games.
A popular multi-purpose tool for file management and NSP installation. FINDPARDISE-(USA)-NSwTcH-[BASE]-NSP-Ziperto.rar
The extracted NSP can be loaded directly into Switch emulators such as or Yuzu (though Yuzu development has ceased) to play the game on a PC. Important Considerations NSP (Nintendo Submission Package), which is the standard