This is the way I force save prompt on .html files .....maybe useful (only 
tested on ie) looks wierd but it works :)
   $headertxt = "Content-Disposition: attachment; filename=\"".$filename."\"";
   header("Content-Type: application/force-download");header($headertxt);


At 06:10 AM 23/08/01, David Minor wrote:
>I ran some tests of different header configurations of 6 browser/platform
>combinations to find out what worked and what didn't.  I didn't cover all of
>the platforms available, just those that my user-base uses, so this isn't
>combinations tested was IE5.5, NN4, NN6 for Windows 98 and IE5.5, NN4.7 for
>Mac 9.1.  I tested all of these browsers using/not using 'attachment' in the
>Content-Disposition header.  and also changed out the Content-Type header
>with 'application/octet-stream', 'application/download', and '*/*'.
>Here's the summary and what I did to make things work as well as possible.
>My goal is to prompt the user with a save-as dialog for an mp3 file.
>IE5.5 for Mac always uses the quicktime plugin to play the file no matter
>what the disposition or type is.  (also no matter what the file extension
>is.  Couldn't figure out how to trick it to download the file.)
>IE5.5 for Win98 would attempt to download the file if ("content-disposition:
>attachment; filename=....") attachment was there.
>All 3 of the Win98 browsers would do prompt with as few clicks as possible
>when content-type was "application/octet-stream".  Therefore,  I test in my
>script for the Mac users and give them "Content-type: application/downlaod"
>while I give other users "Content-Type: application/octet-stream".  Of
>course, this doesn't help the IE5.5 Mac users who still have to use
>"Downlaod Link to Disk" routine to get a save-as prompt.
>Anyone who sees different ways this could be done, please respond.
>Here's my code:
>if (eregi("mac",$HTTP_USER_AGENT))
>    $type = "application/download";
>    $type = "application/octet-stream";
>// stream file to user
>header("Content-Type: $type");
>header("Content-Disposition: attachment; filename=$filename");
>header("Content-Length: ".filesize($tmp_file));
>header("Content-Transfer-Encoding: binary");
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