An asset is a specific, objectified concept in the game that can be highly detailed like a blade of grass, or larger like a building, or intangible like sound effects. Unity defines an asset as, "Shorthand for anything that goes into a video game – characters, objects, sound effects, maps, environments, etc."
Every asset is defined in a set of normalized asset files that describe its relationship to the game, other assets, and itself.
Visual Asset-Related File Formats
The following list contains file formats that are used to compose visual assets such as vehicles and weapons.
The community-devloped tool WolvenKit can be used to browse game archives and extract game files.
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MESH
3d models
XBM (images and Textures)
2d textures mapped onto meshes, advertisements, or any other game asset that uses an image in the game.
APP (appearance)
Sets up appearances for assets such as NPCs and vehicles referenced by entity files
BK2 (Videos)
Bink 2file format (.bk2) that us used for any videos in game (Televsion, quest overlays, or some billboards)
ENT (entity)
Parent file for most visual assets which is directly linked by the Tweak DB
HP (hair profile)
Color ramp data to set colors for meshes using the hair shader
