Downloading AND installing .mobileconfig in Safari (from App) - Not installing

[gwelmarten]

Hi
In our app, we direct the user to download a .mobileconfig. Originally the problem was Safari just displayed the XML rather than downloaded that, but we got around this with a PHP script (below).

<?php
$file = "http://example.com/myProfile.mobileconfig"; 
header("Content-Description: File Transfer"); 
header("Content-Disposition: attachment; filename=\"$file\""); 
readfile ($file); 
?>

However we commonly see it where the .mobileconfig is downloaded and automatically it brings up the 'do you wish to install page'. How is that done? Are we missing something in Content-Type?
Thanks,
Sam