Wolfenstein 3D is a seminal first-person shooter game first released in 1992, pitting the player, a captured American spy, against a horde of WWII-era Nazis ensconced within Castle Wolfenstein. It is widely regarded by critics and game journalists as having helped popularize the genre on the PC, and having established the basic run-and-gun archetype for subsequent FPS games.
There's a much better solution now - download ECWolf http://maniacsvault.net/ecwolf/ Just unpack it in your game folder and launch the ECWolf.exe, it supports all the widescreen resolutions, no stretching.
