The Code_typer.exe file you have requested: Tools and Utilities / Others / Code Typer - 208.8kb is not available. Perhaps try browsing all files for the game Halo: Combat Evolved and upload any files you want to share or are missing. This is the only information we could locate:
This program was made to replace your letters with ALT codes without you having to do the ALT codes themselves. Just press F12 to start and stop the key replacement. Types in the some ALT codes in place of your letters.