Internet Explorer and Progressive JPEG

Im using Internet Explorer 6.0 on Windows XP. My website needs to make use of JPEG Progressive but I notice that IE doesnt handle progressive images -- it just displays it as if it were a standard JPEG image. FireFox and Netscape handle my progressive image perfectly. Now why the hell would MS not support this feature for JPEG? Is there some kind of patch or plugin one could dload to decriple Internet Explorer?

Thanks