And I got another question -_-
How can I edit the levelcode Like : DLCIJNLGCT ?
Sorry, as far as I know, you can't. The levelcode are not actually stored anywhere, but are computed by the game based on a number of things, such as the level's number and rating, how many lemmings you saved, etc. So there's no easy way to set your own levelcodes without changing the program itself.