Nintendo version 1.0.1 is now extremely outdated; the current version of the game is 3.0.0 , which includes compatibility for the The Hidden Treasure of Area Zero DLC.
The file is compressed using WinRAR or a similar utility to reduce its size for sharing. It must be extracted before the NSP can be used. Usage and Legality Pokemon Scarlet (NSP)(Update 1.0.1).rar
Players use programs like Ryujinx or Yuzu to play Switch games on a PC. Nintendo version 1