The file is a RAR (Roshal ARchive) compressed archive, which is a type of file used to store and compress data. The file name suggests that it contains an update for Super Mario Maker 2, specifically version 3.0.2, and is in NSP (Nintendo Switch Package) format.
: All seven Koopalings (Larry, Iggy, Wendy, Lemmy, Roy, Morton, and Ludwig) added as boss options. SUPER MARIO MAKER 2 -NSP--Update 3.0.2-.rar
By downloading and installing Update 3.0.2, players can ensure that their game is up-to-date and that they have access to the latest features and improvements. The file is a RAR (Roshal ARchive) compressed