PrBoom works with multiple released versions of Doom, but has particular naming conventions you must follow if you want the Launcher to see the WAD file.
|Doom ||doom.wad |
|Ultimate Doom ||doomu.wad |
|Doom II ||doom2.wad |
|TNT: Evilution ||tnt.wad |
|The Plutonia Experiment ||plutonia.wad |
|Freedoom ||freedoom.wad |
This is particularily important because the Steam version of Ultimate Doom has the WAD file named doom.wad.