Open the main wad ( doom.wad, or doom2.wad, etc).Here's how to import custom graphics in WAD Mangle: It lacks Wintex's fancier capabilities, but is superior to it in a lot of ways, especially simplicity of use. The best I've found for XP (and Win7 圆4) is WAD Mangle (an excellent utility, and a free d-load, thankfully). I used to use Wintex for this back in the Win95 days, but it doesn't run under XP and up. The DooM engine treats almost everything, including graphics, as some kind of lump. You need one that can import and export lumps. A number of handy utilities are available from doomworld.
