These games are also now available on PC via the Bethesda.net Launcher.
Those who already have the classic original DOS-based games will get the updated versions for free.
The biggest highlight of the update is add-ons support for Doom and Doom II.
Bethesda says add-ons will be free to download.
In this release, the company has also added real-time MIDI playback for add-ons.
This allows for WADs that include custom music to have that played.
Also, some of the engine limitations have been removed to allow for larger MegaWAD files to be loaded.
source: www.techworm.net