<?php
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=file");
header("Content-Transfer-Encoding: binary");
// header("Content-Length: ".@filesize("$FF_DIR$filename"));
@set_time_limit(0);
echo "Содержимое файла";
?>