If you're dealing with a RAR file that contains a CHD or NSP file, you'll need software capable of extracting RAR archives. Once extracted, NSP files can be used with tools designed for Switch game management (like the Nintendo Switch Homebrew Menu or specific tools for managing game files).
: Refers to Version 3.0.3 , which succeeded v3.0.1. mario kart 8 deluxe nspchupdate 303rar full
: This update saw the game version jump from 3.0.1 directly to 3.0.3 (skipping 3.0.2, which was reportedly a version specific to the Chinese Tencent release). Importance of the Update Following the conclusion of the Booster Course Pass If you're dealing with a RAR file that