texture unwrapping problem

So, now that I finally mastered importing a gmax model into FSX, I'm trying to add some textures.
Flight Simulator and other chat
https://forums.simviation.com/phpBB3/
https://forums.simviation.com/phpBB3/viewtopic.php?f=16&t=38231
Do you mind sharing any tips on how to export models in FSX?
Edit: It also might be helpful to know that I created the texture as a normal .bmp and converted it to .dds with "DDS Converter 2.1".
I believe, because the fact that Gmax is being used, he used the same method as FS9