There's no need for the special .bat file anymore. If you have GoldSrc Package 2.4, all you need to do is place the "Hunger" folder in \GoldSrc Package 2.4\Half-Life WON. After you've done that, just open the regular Half-Life (WON).bat file and click "change game" above options. There should now be a game called "They Hunger : Trilogy". If you want custom binds for They Hunger, just create another userconfig.cfg in the "Hunger" folder.