These are essentially digital installers. They are the most common format for updates and DLC. If you are looking for the "Mario Kart 8 Deluxe Update 3.0," it will almost certainly be an NSP file.
If you want the equivalent of “Mario Kart 8 Deluxe + Update 30” on a : mario kart 8 deluxe switch nsp xci update 30 updated
Beyond the file architecture, the update itself fundamentally altered the competitive landscape. The Booster Course Pass tracks, finalized in this update, introduced a different visual style—often utilizing the mobile-optimized assets from Mario Kart Tour . While purists debated the graphical fidelity compared to the original Deluxe tracks, the sheer volume of content added immense replay value. These are essentially digital installers