There's a converter for converting all textures to DDS, which can then be loaded with the DDS loader. This typically works with all mods not hard coded to only load the textures they were developed for (png, etc). http://forum.kerbalspaceprogram.com/threads/98672 running OPM through this converter causes it to not load. I assume because Kopernicus won't accept DDS files. What I'm curious to know is if the other files, not in the kopernicus directory, can be dds files, of if they need to remain png. I can run some tests on my own in time, but I have a stream to start.