This will work for obj to o3d and vice versa.
You must be registered to see links
why have you given him the old converter when A-tools works way better?
OT:
If you mean using the old element glow system, it is quite a messy path you choose.
My recommendation is to use Cinema4D (Any 3d program work, but I liked cinema4d just for this part)
o3d converter (the one ketchup linked to or A-tools)
Convert a weapon.o3d to .obj.
Convert another weapon that you know glow works on (example, bloody weapons) from .o3d to .obj
When opening the bloody weapon .obj file in Cinema4D you will see it got different layers.
One Mesh (The weapon itself)
One wierd looking mesh (The element poly) ((This is where the element is put ingame))
Delete the Mesh (The weapon itself) but keep the wierd looking mesh.
Merge the weapon that has no glow .obj.
Export .obj
Convert to .o3d
Test it ingame.
I first did this when new weapon glow did not exist which was a few years back so sorry for the bad guide. since the "Wierd mesh" is not needed anymore.
So you either do that for each weapon that element glow does not appear on
or you simply add in the new weapon glow system
Good luck.