The .rar is a compressed container. Once extracted, it reveals an .NSP (Nintendo Switch Package) file, which is the standard format for digital eShop content .

This is an Update file , not the full base game. It must be installed alongside the base game to function .

NSP files are primarily used on modded Nintendo Switch consoles running Custom Firmware (CFW) like Atmosphere or on PC emulators . Key Features of Update 1.19.40