Back a year ago, i got the game on steam. When i started playing i got a code with 5 part  in a message box who said : "The game will ask for it further away to unlock additional content" or something like that, i saved the code, and now, i don't have any clue to where i could use it... 

Can you help me? 

Actually, these codes were use in the previous build of this forum, by enterring them in your profile, you were able to badges and title for this forum. Now that this forum work differently, I think that they are totally useless.