Mesh to rig(need help)

So I have this model I got from my employer and he needs me to convert it from .FBX to a .blend but when I import the FBX to blender the bones(rig) have converted to mesh and I don’t want to have to re make the rig so is there a way to do mesh to rig kind of like curve to mesh(alt+C)?

wait, how mesh? ive never seen that happen before.