.JA File Extension
File TypeJet Archive
This file is saved in a binary format, which requires a specific program to read its contents.
What is a JA file?
Game file used by N3V Games' (previously Auran) Jet engine; saves a compressed archive of game files and can include 3D game models and other information; enables game resources to be bundled together instead of across multiple files.
The Jet engine is used for the Trainz series games such as Trainz Railroad Simulator 12.