Because the model is , you can treat it as a puppet. Look for a file with extensions like .ma (Maya), .blend (Blender), or .max (3ds Max). If the rig is "Chelda," it may have a unique control scheme (e.g., "Chelda" might have specific facial controls or a tail rig that the standard "Willey" lacks).
[ Outer Layer: .rar Container ] └── [ Inner Layer: .zip Archive ] └── [ 3 Individual Sets of Data / 3D Schematics ] 1. Multi-Part Compression & Server Parity Willey Models Chelda Model - 3 sets -.zip.rar