There is only one file type that uses the .XRF extension:
Cal3D XML Materials File
3D materials file created in the Cal3D XML materials format; contains references to the graphics that are overlaid on a model's 3D mesh to provide its surface appearance; can specify settings for diffusion, shininess, and ambience.
Cal3D is an open source 3D character animation library written in C++.
Updated: February 2, 2011