: Preferably, for safety and legality, use official channels (like the Nintendo eShop) to download and install game updates. Official updates ensure the integrity and performance of the game.
Sonic Frontiers -NSP--JP--Update 1.4.1- -2-.rar appears to be a compressed archive containing a Japanese ( ) version of the Nintendo Switch (.NSP) update file for Sonic Frontiers . Specifically, this archive contains Update 1.4.1 Sonic Frontiers -NSP--JP--Update 1.4.1- -2-.rar
RAR (compressed archive)