if($_POST['mode']=="save") {
$root = $_SERVER['DOCUMENT_ROOT'];
$path = "/mcboeking/";
$path = $root.$path;
$file_path = $_POST['path'];
$file = $path.$file_path;

if(!file_exists($file)) {
    die('file not found');
} else {
    header("Cache-Control: public");
    header("Content-Description: File Transfer");
    header('Content-Type: application/force-download');
    header("Content-Disposition: attachment; filename=\"".basename($file)."\";" );
    header("Content-Length: ".filesize($file));
    readfile($file);}}

As soon as i download the file and open it i get an error message. When i try to open a .doc i get the message : file structure is invalid. And when i try to open a jpg : This file can not be opened. It may be corrupt or a file format that Preview does not recognize.

But when i download PDF files, they open without any problem.

Can someone help me?

P.s. i tried different headers including : header('Content-Type: application/octet-stream');