I need to convert all my addon airplane textures to DXT5 format including mipmaps. I started using dxtbmp for the purpose. But it is quite a drag to manually open-convert-save each of the hundreds of texture files. Is there any easy way out of this? something like running a batch file to do it all at once?

Why do you think you need to convert all those files? FSX is perfectly content using the original DXT3 bitmaps :-roll However, to answer your question, the author of DXTBMP also has a utility program that will accomplish the task.http://www.mnwright.btinternet.co.uk/beta.htmLook for ConvImX

but most of them dont have mipmaps included