Game archive used by the BioWare's game engine technologies, such as the Aurora Engine, Eclipse Engine, and the Odyssey Engine; may contain various types of data for a game, including models, textures, animations, audio, and game levels; used for packaging original game content as well as for creating modifications and add-ons to the game.
ERF files can be edited with the ERF Editor component of the Dragon Age Toolset. They can be packaged together into .DAZIP files for deployment within the Dragon Age: Origins game.
The Aurora Engine is used for games such as Neverwinter Nights and The Witcher. The Eclipse Engine is used for Dragon Age: Origins, and the Odyssey Engine is used for Star Wars: Knights of the Old Republic. Each of these games use ERF files.