: The file is likely packed to save bandwidth. You will need a tool like WinRAR or 7-Zip to extract the .nsp file inside.
: A "Nintendo Submission Package" used for digital game distribution. Metroid Dread (NSP)(Update 2.1.0) (2).rar
Found by pressing on the "Samus Files" screen, these allow you to fight the game's 12 major bosses sequentially. : The file is likely packed to save bandwidth