What is a wad file and how do I open a wad file?
WAD is a game data file used by Doom and Doom II, as well as other first-person shooter games that use the original Doom engine. It contains data such as sprites, level information, items and other game data, and is used for storing original game content as well as game modifications.
Relevant wad file links:How to open wad file on Youtube
How to open wad file on Wikipedia
How to open wad file on Microsoft.com