Doom95

Doom95 is an official source port of Doom to Win9x operating systems. This port was created by Microsoft to serve as a flagship for their DirectX technology, and was released on August 20, 1996. It supports four screen resolutions (320x200, 320x240, 640x400 and 640x480) and has a launcher to configure options for external PWADs, player controls and multiplayer settings. It supports a slightly higher visplane limit than the original Doom allowing for more complicated maps. Doom95 works with Doom, Ultimate Doom, Doom II and Final Doom. It also has cheat codes that are exclusive to it, such as the ability to kill all of the monsters in a level.

Bugs
Due to a bug in its handling of modern graphics cards, Doom95 does not render the "invisibility" effect (spectres and, in multiplayer games, partially invisible players) in its original form. Instead of seeing directly through the sprite, the player sees a wall texture or other background "refracted" through the creature's body at a slight angle, as though looking at an object through a glass of water. This makes invisible enemies somewhat easier to see, especially in dark rooms; on the other hand, tracking the movement of non-invisible creatures behind them can be more challenging, especially when trying to aim one's weapon through a pile of invisible corpses (which can easily occur, for example, in E1M9: Military Base).