Firefox and IE downloading the files inside the browser instead of a save dialog

[zoparrat]

I tried using the script with:
/download.php?f=postgre_oct10_2007.backup&fc=postgre_oct10_2007.backup

I've added 'backup' => 'application/octet-stream' to download.php
I also tried with 'backup' => ''
I even tried doing the same using a .zip file. No matter what I try, firefox and IE try to load the files inside the browser, displaying corrupted letters etc.

What might I be doing wrong ?

[zubrag]

It shows download box for me in both Firefox and IE. I tried

$allowed_ext = array (
  'backup' => ''
);

and

$allowed_ext = array (
  'backup' => 'application/octet-stream'
);

Maybe following would work for you

$allowed_ext = array (
  'backup' => 'application/force-download'
);