How do I make the game use a single skin?

[Hell's Angel]

I've noticed that some units have two skins unitname.dds & unitname_128.dds
I reskinned one of the them but the game always uses the other one.
Tried using the same one for both and it was all messed up.
Tried searching in the xml's too and didn't find anything.
Can someone please help me out?

 

[Haarbal]

there is always the most easy solution.
just copy your unitname.dds file, and rename it to unitname128.dds, so that you have the same skins names unitname.dds and unitname128.dds