Specifically, the file format is used for Nintendo Switch packages, and Update 1.14 indicates it includes the "Jackie & Daria" content, which was the final major functional update for the game.
regarding how to install or extract this specific file type onto a device? Spiritfarer (NSP)(Update 1.14) (2).rar
Since you are looking for a "helpful guide" related to this specific file, it could mean one of two things. Could you clarify if you need: Specifically, the file format is used for Nintendo