What is an NSP file?
An NSP file is a eShop game package used by the Nintendo Switch console and Switch emulators, such as Yuzu or Ryujinx. It stores multiple files, which may include the game ROM, .JPG game icon, game updates, and game metadata. NSP files are typically used for storing backup dumps of Switch games
NSP files can be played on a Nintendo Switch using SX OS and Atmosphere and ReiNX custom firmwares used to play NSP files on a Nintendo Switch using the Goldleaf homebrew application.