$ctype = "application/tgz"; 
		header("Pragma: public");
		header("Expires: 0");
		header("Accept-Ranges: bytes");
		header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
		header("Content-Type: $ctype");
		header("Content-Disposition: attachment; filename=filename1.tgz");
		header("Content-Transfer-Encoding: binary");
			
		$filename = "/folder/file.tgz";

                $handle = fopen($filename, "r");
			
		while( $contents = fread($handle, 1024))
		{
  	             echo $contents;

                     flush();
		}
			
		fclose($handle);

$filename = "/folder/file.tgz";
$size = filesize($filename);
			
		while( $contents = fread($handle, $size))
		{
  	             echo $contents;

                     flush();
		}