There you go!
You looked behind the curtain and saw the Magic.
Now you can hand edit the rest of the file to be proper for GR2 format.
Just copy and paste V or VT or VN's to MATCH which ever is highest in counts!
You could also just add with 0's. So V 0.0 0.0 0.0 will work. Your just filling space.
Since no FACE calls them? You'l never see them!
I do suggest using Blender files as they are way smaller but produce the same results! Plus you get the modifier you like.
Not sure WHY the Wings files have so many Normals compared to the Blender files?