Well, of course you're free to view it as you like, but I would consider missing textures (all over the world, not just in the areas affected by this mod) to be a bug. Second, it is quite viable to play with OpenGL as a graphics library for this game and other games (though I understand your opinion...

So, OpenGL. :) I've found a solution to the missing textures and applied it to various mods, verifying that it worked for RoEx as well. The issue apparently lies in the compression of the DDS files: if they use DXT1, they don't work, DXT5 they do. DirectX is more forgiving and will use other formats...