FS9 Textures not working

So I downloaded the Sonerai II file from simviation and decided that purple is not really my colour. So, I converted it into a 24-bit BMP using DXTBmp and repainted it blue and white. Then, I put it back into DXTBmp and converted it to an Extended BMP. When I opened FS9, the Sonerai was all Gray. What have I done wrong? What File type does fs2004 textures use?

Hi,

 

FS9 typically uses DXT3 format, although I often use 888 32 bit format for flyable aircraft, because it gives a higher quality.