The "GOG" in the filename refers to GOG.com , a platform known for its "Good Old Games" philosophy.
The .rar file is often the starting point for extensive community-led restoration projects: RobertBeckebans/RBDOOM-3-BFG: Doom 3 BFG ... - GitHub Doom.3.BFG.Edition.GOG.rar
: The original Doom 3 was defined by its oppressive darkness, forcing players to choose between holding a flashlight or a weapon. The BFG Edition introduced a "shoulder-mounted" flashlight, allowing players to see and shoot simultaneously. While more "accessible," critics argue this stripped away the "feisty" lighting effects and tension that made the original a masterpiece of horror. The "GOG" in the filename refers to GOG