FSN (Pronounced Fusion) or File System Navigator is a Irix based application used to browse through a user’s file directory in 3D space.

Though installed on the Irix computers of Jurassic Park, neither Ray Arnold or Dennis Nedry made use of it, preferring instead to use the faster method of entering Command Prompts. Being unfamiliar with the System, Ellie Sattler opened the application in an attempt to reboot the Park’s core systems. It was then navigated by Alexis Murphy who successfully brought the Park back online.