I need to know how to make a mod, as in a custom game activated from the half-life menu. I need this because im modifying titles.txt, and other things you dont want to change in your original half-life, in addition to not making the downloader stuff a bunch of sounds in valve/sounds. Im not modifying the game in any way, i just need someway to keep from overwriting critical half-life files. Thanks in advance for the help