From SCEE Cambridge Wiki

The MWI is essentially a key to an MWD file; it contains information about every file in the archive. It is generally located in a game's executable. It also contains file entries for files inside of WADs.[1]

Behind the scenes


It is believed that MWI stands for MediEvil WAD Index or Millennium WAD Index. The acronym WAD was coined during the development of Doom and stands for Where's All the Data?[2]


  1. Frogger File Information Megathread on Highway Frogs. Published May 13, 2019. Retrieved November 3, 2023.
  2. Appendices; 5 Years of Doom on Doomworld. Retrieved November 3, 2023.