FS uses 'extended bit maps' which I don't really understand myself, but I do know that they must be converted to a 24bit bmp
Think of bitmaps as being a class of image files. In that class are several different formats including several different types of extended bitmaps.
Some of the bitmaps used in FS are 24 bit and can be viewed by any image viewer. The panel bitmaps in the panel folder for the 2D panel are a good example.
The extended bitmaps used by FS for the 3D models consist of 8 bits per pixel for each RGB channel (Red, Green , Blue), for a total of 24 bits. This is the same as most common bitmaps.
Where the extended bitmaps differ is they also have 8 bits per pixel for the Alpha channel which controls reflections/transparencies.
What DXTBmp does is seperate the Alpha channel from the RGB into 2 seperate and editable images. When you save an extended bitmap with DXTBmp it combines those 2 images back into 1 extended bitmap usable by FS.
Hope this helps clear things up.
Joe
Don't argue with idiots, they drag you down to their level and beat you with experience.