Hi Freak. I was just going offline so this will be quick. Download DXTBmp here. http://www.mnwright.btinternet.co.uk/index.htm
Use it to open the textures with so you can edit them. Paint will have to do for now. After editing, save & reload in DXTBmp. Then Reload the edited texture in DXTBmp save out as Extended Image in DXT1 Opaque format. For more info check out the Aircraft Repainting forum.