: This stands for Nintendo Submission Package . It is a standard file format used for Nintendo Switch digital software, updates, and DLC.
: Some users utilize tools like NSC Builder to "merge" the base game and this update into a single file to save space or simplify installation. Important Safety Warning WRC Generations (NSP)(Update 1.1.0).rar
: The update is wrapped in a RAR archive, meaning you must extract it using a utility like WinRAR or 7-Zip before it can be used. Usage in Emulation and Homebrew : This stands for Nintendo Submission Package