The model was made in a special branch of FreeCAD, so it won't work in regular FreeCAD. It will open though, and modeling steps can still be viewed, and BRep shapes can be extracted. It will fail to be recomputed if you try changing the parameters.
The model is also available in:
STEP format (compound)
Since the model was made for a specific motor that I had, it is probably not very useful.