HaloMods "Classic" Read-only Archive

ok call me a nub or w/e if u want i have the trail version and i was wondering if i can edit things in there? and i cant find any programs on the net so if u can give me a site

ok, 1)you misspelled trial
2)get the demo offset list from iron forges site
3) get a hex editor
4)mod away

You can use halo map tools 3. It is in the downloads section, you will find it much easier to do than hex editing.