An NSP (Nintendo Submission Package) is the standard digital format for Switch games. By packaging the emulator and its 11,000-game library into an NSP, users can install it directly to their Switch home screen, making it look and feel like an official game.
The "NSP" file is a single installer. Because 11,000 games result in a 30GB+ file, this NSP is usually split into parts (001, 002, etc.). You will need a file joiner (like HJ-Split or 7-Zip) to combine them into a single .nsp file. Pfba - 11000 Games Nsp