I'd just like to interject for a moment. What you're refering to as Doom, is in fact, UZDoom/Freedoom, or as I've recently taken to calling it, Freedoom plus UZdoom. Doom is not a game that can run on modern operating systems unto itself, but rather another component of a fully functioning UZDoom system made useful by the ZDL Launcher, Zscript and ACL scripting languages, DeePsea editor, and other vital components comprising a fully functioning First-Person Shooter game.
Many gamers play a modified version of the UZDoom system every day, without realizing it. Through a peculiar turn of events, the version of UZdoom which is widely used today is often called Doom, and many of its users are not aware that it is basically the UZDoom system, developed by the UZDoom Project.
There really is a Doom, and these people are playing it, but it is just a part of the game they play. Doom is the WAD: the data file containing levels and graphics for the game engine to access. The WAD is an essential part of a FPS game, but useless by itself; it can only function in the context of a complete FPS game. Doom is normally used in combination with the UZDoom engine: the whole system is basically UZDoom with Doom or Freedoom added, or UZDoom/Freedoom. All the so-called Doom distributions are really distributions of UZdoom!
#Doom #Freedoom #UZdoom #Zdoom #Copypasta