There is only one file type that uses the .TZARC extension:
A TZARC file is an archive created by N3V Games Trainz: A New Era, a 3D train simulator video game. It contains saved game data, which includes train route, railyard, and scenario information. TZARC files allow users to restore game sessions in case of a game crash or a user wants to revert to a previous save.
TZARC files are created every time you save your game in Trainz (or ). The archive is saved in the "backups" folder in the game installation directory. To locate your most recent save, sort the TZARC files in the folder by date. TZARC files can only be opened using the "Content Manager" in Trainz: A New Era and TZarchiver.
NOTE: Trainz was originally developed by Auran, which became N3V Games.
Updated: May 26, 2018