Thanks for this, LaunchBox helped me to export the working roms from a 80gb MAME 244 romlist - cutting it down to 11 gb! Now there is room on our drives for 30 gb in CHD files. We use Maximus Arcade as a front end, so renaming the graphic files that LaunchBox downloads will let us use those in Maximus Arcade (hopefully) - although the file sizes of those are pretty big too, does anyone have a good jpg shrink utility?