Missing in Action cheats and cheat codes for PC

Master cheat code:
Go to the mission room, then click on the dog tags, then type "mia cheats"
as a code to enable all cheats.

Get all medals:
Hit [F1] at the mission room, then type "mia medal full" as a code 
to unlock all medals.

Select any mission:
Hit [F1] at the mission room, then type "mia levels" as a code to 
select any mission.

Mission completed:
Hit [F1] during the game play, then type "mia complete" as a code 
to complete a mission.

Invincibile mode:
Hit [F1] during the game play, then type "mia dog" as a code to 
enable invicibility.

Misc cheats:
There are also a several files cheat.* in one of the game
directories where you can find other cheat codes.