Archive file used by some games like Thief 2: The Metal Age, Thief: The Dark Project or System Shock 2. Note: This database record has not yet been verified by File-Extensions.org. It was added in the past to the list and appeared to be accurate.
Three-dimensional materials file created in the Cal3D binary materials format; stores references to the graphics that are overlaid on 3D meshes to provide the model's surface appearance; also stores ambient, diffuse, specular, and shininess lighting properties. CRF files are the binary version of .XRF format, which stores the material references and properties in an XML format.