Instructions
Select the "Start" button on your computer's desktop to open the start menu.
Select the "Run" option in the start menu.
Type the filepath for your "Midtown Madness" game into the "Run" text box, then type "-allcars" to unlock every car in the game. For example, if you have installed the game using the suggested filepath, type the following into the "Run" text box:
C:\Games\Midtown\midtown.exe -allcars
Begin playing your game to ensure that the code has been entered correctly and that all cars are unlocked.