Under the category of game files, the .wad file extension is created using an application called Wally, a freeware texture editing program. The files with .wad extensions are compressed archives of textures used in games, like Half Life, Doom, Quake, Hexen, and Heretic - all of which are first-person shooting games running in PCs.There are two types of WAD files. The IWADs are .wad files that contain data required to have the game loaded. This is while the PWADs have additional data like character sprites, custom levels, and so on.The data contained in .wad files are commonly single levels, most of which pertain to the original theme of the game. Even if WAD files are used in assorted PC shooting games, each is created differently, depending on the application used. This might include sound effects, background music, graphics, settings, and the like. Settings incorporated into .wad files are single-player configurations and death-match multiplayer levels.A single .wad file may hold a total of 8 to 10 in-game levels, and is often termed as a megaWAD. Certain .wad files may contain 30 or more game levels, like those used in Doom and Doom II.Some .wad files are called conversion files, which incorporate the appearance and behavior of enemies, weapons, levels, and more. The two types of conversions are: 1) partial conversion, and 2) total conversion. Partial conversions only modify constants in the game, while total conversions change major settings in the application, including levels, weapons, enemies, basic game play, and others.Normally, a WAD file depends on the author that created it. The Wally application allows MOD designs of users to be incorporated into the game using a graphical user interface (GUI). In such cases, files with the .wad extension are loaded into the application manually; but will be detected automatically by the game when they are saved into their designated folders.
The WAD file extension is used by Doom I, II, Ultimate Doom, Final Doom and other games, which use Doom engine. The .wad files are game archives that contain game data such as maps, graphics, sprites, sounds, music etc.. WAD is the abbreviation of War Allocation Daemon or Where's All the Data?. Doom engine uses two types of WAD archives IWAD and PWAD. IWAD (Internal WAD) contains original game data (doom.wad, doom2.wad etc.) and PWAD (Patch WAD) contains contains lumps of data created by a user as an add-on.