The model is question is from game called Fallout 4. A creature model. It was ported from Fallout 4 and edited into another program called Source Filmmaker. What I liked to do is port it back to Fallout 4.
The edited model ported to Source Filmmaker shares a rig similar in structure to Fallout 4's skeleton, but has a few additional new bones. I'd like said additional bones to also be added onto the Fallout 4 skeleton's as well when porting over the model back into Fallout 4.
If you can use blender, there are scripts for importing both models. If not, I will have to convert them and send it.