This is the official file format used for games downloaded directly from the Nintendo eShop. It contains the game code, digital licenses, and assets.
No. Sunbreak is an expansion, not a standalone game. You must have the base Monster Hunter Rise game installed (either via physical cartridge or digital NSP) for the Sunbreak DLC to function. How big is the Monster Hunter Rise: Sunbreak repack file? monster hunter rise sunbreak switch nsp eshop repack
This is a classic indicator of missing or outdated sigpatches. This is the official file format used for