What setting was used in the generic science fiction role-playing game (RPG) based on the "D6 System",  that was derived from  a role-playing game set in the "Star Wars" universe?
Star Wars: The Roleplaying Game Star Wars: The Roleplaying Game is a role-playing game set in the "Star Wars" universe, written and published by West End Games (WEG) between 1987 and 1999. The game system was slightly modified and rereleased in 2004 as "D6 Space", which used a generic space opera setting. An unrelated "Star Wars" RPG was published by Wizards of the Coast from 2000 to 2010. Since 2012 the official "Star Wars" role-playing game is another unrelated game, published by Fantasy Flight Games.
Descent: FreeSpace – The Great War Descent: FreeSpace – The Great War, also known as Conflict: FreeSpace – The Great War in Europe, is a 1998 space combat simulation IBM PC compatible computer game developed by Volition, when it was split off from Parallax Software, and published by Interplay Productions. In 2001, it was ported to the Amiga platform as FreeSpace: The Great War by Hyperion Entertainment. The game places players in the role of a human pilot, who operates in several classes of starfighter and combats against opposing forces, either human or alien, in various space-faring environments, such as in orbit above a planet or within an asteroid belt. The story of the game's single player campaign focuses on a war in the 24th century between two factions, one human and the other alien, that is interrupted in its fourteenth year by the arrival of an enigmatic and militant alien race, whose genocidal advance forces the two sides into a ceasefire in order to work together to halt the threat.