AC (file format)
Program and/or Extension Function: AC3D Geometry File
Specific Notes: An AC3D file (usually named .AC) is a text file describing the geometry of a model. AC3D files retain all available information about a model built with AC3D, e.g. textures, surface settings, materials, object data etc.
File Classification: Text
Identifying Characters: Hex: 41 43 33 44, ASCII: AC3D