Note: This procedure requires editing a game file; creating a backup copy of the file before proceeding is recommended. Reach the end of mission screen with the customize, quit, and continue options. Press ALT + TAB to return to Windows. Use Windows Explorer to enter the "Variant" sub-directory in the game directory. The files in this directory represent various vehicles in the game. A text editor can be used to view the contents. Once you select a new vehicle from one of the "Variant" files, copy that file into the main game directory. Delete the "User" file in the main game directory, then rename the copied "Variant" file to "User". Press ALT + TAB to resume game play with the new vehicle.