Doom WAD
From Just Solve the File Format Problem
WAD ("Where's All the Data") is the format in which the data (music, sound effects, textures and levels) for games using the Doom engine is stored.
Sample files
- http://cd.textfiles.com/doomcompanion/DOOM/DOOM1.WAD
- http://cd.textfiles.com/instantdoom/WADS/
- https://telparia.com/fileFormatSamples/archive/wad/