Here ya go:
http://files.halomods.com/viewtopic.php?t=6
As a side note, are you sure that this is what you need? I only looked at a few pages for getting console commands to work but they said the same thing. In order to use the commands, you don't use this, you add options to the shortcut you use to actually open Halo for your PC. Here's a link for doing that plus a bit more:
http://www.gamefaqs.com/computer/doswin/code/13511.html