<?php
$filename="gri.rar";

header("Pragma: public");
header("Expires: 0");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Cache-Control: private",false);
header("Content-Type: application/octet-stream");
header("Content-Disposition: attachment; filename=".basename($filename));
header("Content-Transfer-Encoding: binary");
header("Content-Length: ".filesize($filename));
ob_clean();
flush();
echo readfile("$filename");
?>