403624 - Content-Disposition's filename is being ignored

Status: RESOLVED DUPLICATE of bug 299372

(Firefox :: File Handling, defect)

Description

[Till Krüss]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.8.1.9) Gecko/20071025 Firefox/2.0.0.9
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.8.1.9) Gecko/20071025 Firefox/2.0.0.9

I'm using a small script to download files via PHP:
header('Content-Type: application/x-zip');
header('Content-Disposition: attachment; filename="archive.zip"');
header('Content-Transfer-Encoding: binary');
header('Content-Length: '.filesize($file));
readfile($file);

I'm redirecting the files like this:
http://domain.com/download.php?file=archive.zip
and it works fine,
but If I right click save as this href I'm getting the download.php
in the save as dialog, instead of archive.zip
This happens also if I'm using:
header('Location: http://domain.com/archive.zip');
in the PHP script.

Reproducible: Always

Actual Results:  
downloading download.php

Expected Results:  
downloading filename.ext