problema script che forza il download

[Bruce5000]

Salve,
ho un problema con uno script che forza il download di un file;
il file viene scaricato ma quando vado ad aprirlo mi dice "Inaspettata fine dell'archivio".
Potete aiutarmi?
Questo è il codice:

    $file = "download/myfile.rar";
    $file_mostrato = "myfile.rar";

    header("Content-Type: application/rar");
    header("Cache-Control: public");
    header("Content-Description: File Transfer");
    header("Content-Disposition: attachment; filename=".$file_mostrato);
    header("Content-Transfer-Encoding: binary");
    header("Content-Length: " . filesize($file));
    readfile($file); 

[satifal]

Provato in locale e funziona.

[peppescocuzza]

io uso questo codice e mi trovo molto bene

<?php

// place this code inside a php file and call it f.e. "download.php"
$path = $_SERVER['DOCUMENT_ROOT']."/"; // change the path to fit your websites document structure
$fullPath = $path.$_GET['download_file'];

if ($fd = fopen ($fullPath, "r")) {
    $fsize = filesize($fullPath);
    $path_parts = pathinfo($fullPath);
    $ext = strtolower($path_parts["extension"]);
    switch ($ext) {
        case "pdf":
        header("Content-type: application/pdf"); // add here more headers for diff. extensions
        header("Content-Disposition: attachment; filename=\"".$path_parts["basename"]."\""); // use 'attachment' to force a download
        break;
        default;
        header("Content-type: application/octet-stream");
        header("Content-Disposition: filename=\"".$path_parts["basename"]."\"");
    }
    header("Content-length: $fsize");
    header("Cache-control: private"); //use this to open files directly
    while(!feof($fd)) {
        $buffer = fread($fd, 2048);
        echo $buffer;
    }
}
fclose ($fd);
exit;

?>

e poi per scaricare il file usi download.php?download_file=download/myfile.rar