The (Nintendo Submission Package) is the file format used for digital games on the Nintendo Switch. For Mortal Kombat 11 , the base NSP includes the initial launch version of the game (v1.0.0) without any patches or DLC.
The game saw major post-launch content waves: mortal kombat 11 switch nsp update dlc
Disclaimer: This guide assumes you own a legitimate copy of Mortal Kombat 11 and are using custom firmware for archival/backup purposes. Piracy harms developers. The (Nintendo Submission Package) is the file format