Convert To DDS?

How do I convert to DDS? I have it opened in RW_Tools and when I press convert it says "Unspecified Path" or "Cannot Convert" errors, any help? Also are bobbel66's 90000FT trailer repaints for the SD75 Trailers?
https://www.railworksamerica.com/forum/
https://www.railworksamerica.com/forum/viewtopic.php?f=29&t=6373
bnsf subdivision wrote:Try DXTBMP it's free: http://dxtbmp-4.00.84_graphic-editors_g ... ectory.de/