Assuming you have dumped your own cartridge or purchased the eShop version and are backing it up via homebrew tools, here is the standard process to install the file:
The file format you mentioned refers to a Nintendo Submission Package , which is a digital game format used exclusively for the Nintendo Switch and its emulators. Officially, this game is sold on the Nintendo eShop as part of the Life is Strange: Arcadia Bay Collection . Key Remastered Features Life is Strange Before the Storm Remastered-NSP...
The Remastered version brings several technical and content updates over the original 2017 release : Assuming you have dumped your own cartridge or
Your (Internal memory or MicroSD card?)
(playing as a young Max Caulfield) and additional outfits for Chloe, such as the "Zombie Crypt" outfit. Unique Gameplay Mechanics : Chloe uses her "Backtalk" Unique Gameplay Mechanics : Chloe uses her "Backtalk"
A nostalgic, bittersweet prequel chapter where players control a young Max Caulfield before she moves to Seattle.
When docked, the game scales up, allowing you to enjoy the enhanced lighting and texture work on a larger display.