. It is the standard archive format Nintendo uses for digital content on the eShop.
Use a title manager on your Switch to install the NSP. Once installed, the game appears on your standard Switch home menu just like a digital eShop purchase. Critical Next Steps: Updates and DLC super smash bros ultimate nspbase gamepart
Ensure all parts are in the exact same folder and share identical names except for the part number. Right-click on . super smash bros ultimate nspbase gamepart