secure (https) file download

[Anon]

I am trying to send a file to the browser using a sequence similar to:

header("Content-Type: application/octet-stream");
header("Content-Disposition: attachment; filename=$filename");
header("Content-Transfer-Encoding: binary");
@readfile($path.$realfilename);

This works fine using http, but fails on https connections with IE and Netscape browsers.

Has anyone had success in doing file downloads over https?

Thanks!