Thread:Project:Support desk/img auth.php and IE

Hi, I'm using mediawiki 1.15.5 with img_auth.php. Everything works great on Opera and Firefox but in IE I can't seem to open files that are not images. This seems like its the same problem as mine: https://bugzilla.wikimedia.org/show_bug.cgi?id=18858 but editing the headers don't fix my problem. Does anybody have any tips?