It's very confusing. I watched your video but I couldn't find any solutions.
I don't have trouble to put texture on my objects. The problem is to select a texture wich is among a lot of others. Like my picture above.
You said it's a question about UV map? I never used this before. Warband seems to use for their prop called "box_a" the plank whithout much things. For example, the box_a used the material "objects" which refer to the picture above. Any normal or UV map appear in this. They just pick up the right texture into the file (the plank ones).
I'm not sure I'm right, maybe not, but that's look soo weird
Thanks for your answer anyway
Edit: I'm using gimp and 3dsmax + openbrf ofc