Here are some cheats and tips for the game Tie Fighter.
Mission select, ship select:
Enter BONUS as a name on the pilot registration screen. Open the door on the
top right. Select the “Enter mission” option. Open the “Tie Fighter” folder,
“DATA” file, “MISSIONS” file, and the next item that appears. Exit the mission
that appears. Any mission in the game may now be selected for game play with
any ship, including the Tie Defender and Missile Boat.