"Open the FSX texture in DXTBmp and flip the image and Alpha... not mirror"I don't see anyone "doing anything wrong," it's in the details:
"FSX default textures" are in .dds_dxt5 format and according to Martin Wright are treated the same as before.
When using Extended BMP formats (DXT3), the images have to be flipped -- as so eloquently pointed out in this thread and by Martin Wright at his forum.
What we are doing differently is: Discussing two different file formats which both will work as FSX repaints: The FSX .dds textures (which shipped with FSX) and Extended BMP files which also will work in FSX (flipped and with mipmaps applied).
That's my story and sticking to it
I've only repainted one FSX plane successfully so have not yet reached 'Expert FSX Repainter' status . . .