How to Fix IE "Save" bug

It was found that clicking on download Links in PGD Internet Explorer showed File not found error. However user could save file with "SAVE AS". To fix it add "Cache control" lines in dl.php

header('Cache-Control: max-age=10800, private');
before
$gm->getAttachment($attid, $mid, "php://output", true);

For detail you can check patch: http://sourceforge.net/tracker/index.php?func=detail&aid=1395028&group_id=125071&atid=701492