I know that a long time ago, I often converted the BMP texture files to DDS files, but I no longer have any liveries, other than the default grey one, on my B-52.
Unfortunately, any of the liveries I may have converted were lost due to a HDD failure on the drive I had them saved to. :(

Many of the links to liveries are no longer available (i.e. Nathan Phillips), or are on Avsim, but I find it strange that the textures would be BMP, and not DDS.

Note. Nearly all of my Captain Sim aircraft only have default liveries in FSX.