dds or bmp textures shouldn't matter. FSX reads them both fine (normally).
further, the default liveries use a lot more than 4 files, but to take less disk space, they use fallback textures. All texture files that are used by all liveries, are only placed in the first texture folder, and the other are told to go look for missing files there... (very basically explained)
This is an FSX feature, and wasn't possible in FS9 if I'm not mistaken.


To get your addon livery working, try these steps:

1) Only place the repainted texture files in your new texture folder (probably only the 4 you see in other texture folders: 727_100_2_T, 727_100_3_T, 727_100_A_T and 727_x_10_T) the exact number of files depends on the repaint artist, what files he repainted or not.

2) Go to a default texture folder, and copy the file texture.cfg to your new texture folder. This is the part that tells FSX to go look for missing textures somewhere else.

3) Edit the aircraft.cfg file as you would normally.

4) Give it a try!

5) if you know how, you can make a thumbnail to make the repaint show up with a nice picture when you're choosing your aircraft in FSX.



I currently don't have the time to test it myself, but if I can, I will do it this weekend, and edit this post as necessary.

Hope this helps...

Lars