In the world of Nintendo Switch file types, an (Nintendo Submission Package) is a digital format used for games, updates, and DLC. The "3.0.1" refers to a specific version of the game.
To access Mystery Gifts or participate in online competitions, your game version must match the current Nintendo standards. How to Install the 3.0.1 Update
Furthermore, downloading NSP files for games you do not own is considered piracy. To stay within legal boundaries, it is recommended to "dump" your own game files and updates from your physical cartridge or legitimate eShop purchase using a hacked Switch. Final Thoughts
