<?
// Tells the browser that where going to run a PHP script.
$file = $_GET['file'];
// Get a filename from the GET parameters.
Header ("Content-type: octet/stream");
Header ("Content-disposition: attachment; filename=".$file.";");
Header("Content-Length: ".Filesize($file));
// Sends the brower headers to tell it that its sending that file back to it.
Readfile($file);
// Reads the file from the server and send it to the browser.
Exit;
?>
// Closes the PHP script.