It's probably because of the material file:
I don't know if you have already solved the problem.
Only the preset_11 and preset_12 files have the right coding for wings (maybe preset_10 too).
As for that tutorial, are you sure you put the number where it has the "#"?
You are meant to save it as preset_5equip.png or preset_5equip.jpg.
Hope this helped, I have no idea if you solved it or not yet.