Hi

I wanted to do a repaint on the FSX Grummin Goose. Well I took the usual route that I would take for FS9. I did the repaint with my editer and saved the bitmap with DXT, didn't chang anything. I saved the bitmap in the same format and this is what happend. It whent all black and did weird stuff. Is there a diffrent way to repaint aircraft for FSX  

This isn't an answer, just some info from someone who has done some FSX texturing.

There's a very complex relationship between all these bitmaps and all their alpha channels. Not only does the diffuse map have an alpha.. so does the specular map..  and when you throw in the bump-map, it gets more complex. If you don't have it all just right, things go black; textures get "foggy"; chrome turns black at night.. and glass goes opaque..

You need to study the SDK, and even that's just a guide-line. Practice and experiment.. a lot 

You need to have FSX deluxe to load the SDK.. then there's a SP1 for it,,,

It's got some great, interactive illustrations.. a teapot that displays what happens as you change all the bitmaps and their alphas...

If you don't have FSX deluxe just search and read forums like this one, and www.freeflightdesign.com  ..

Eventually you'll start piecing it together...  I'd post a "How to", but I'm still learning