Mail med fil

Hej denne side virke ikke helt. Mine filer der bliver sendt kan ikke åbnes hvad gør jeg forkert??

if(isset($_POST) && !empty($_POST)) {
  $emne = $_POST['emne'];
  $besked = $_POST['tekst'];
  $fra = "ungdomsudvalg@roklubbenfureso.dk";

  //hvis der er en fil
  if(!empty($_FILES['vedhaeft_fil']['name'])) {
    $file_name = $_FILES['vedhaeft_fil']['name'];
    $temp_name = $_FILES['vedhaeft_fil']['tmp_name'];
    $file_type = $_FILES['vedhaeft_fil']['type'];
      
    $file = $temp_name;
    $content = chunk_split(base64_encode(file_get_contents($file)));
    $uid = md5(uniqid(time()));

    $header ="From: ".$fra."\r\n";
    $header .= "Reply-To: ".$fra."\r\n";
    $header .= "MIME-Version: 1.0\r\n";
    $header .= "Content-Type: Multipart/mixed; Boundary =\"".$uid."\"\r\n\r\n";
    $header .= "This is a multi-part message im MIME format.\r\n";

    $header .= "--".$uid."\r\n";
    $header .= "Content-Type: text/plain; charset=iso-8859-1\r\n";
    $header .= $besked."\r\n\r\n";

    $header .= "--".$uid."\r\n";
    $header .= "Content-Type: ".$file_type."; name=\"".$file_name."\"\r\n";
    $header .= "Content-Transfer-Encoding: base64\r\n";
    $header .= "Content-Disposition: attachment; filename=\"".$file_name."\"\r\n\r\n";
    $header .= $content."\r\n\r\n";

  } else {

    $header ="From: ".$fra."\r\n";
    $header .= "Reply-To: ".$fra."\r\n";
    $header .= "MIME-Version: 1.0\r\n";
    $header .= "Content-Type: text/plain; charset=iso-8859-1\r\n";
    $header .= $besked."\r\n\r\n";

  }


//send mail til webmaster
     if (mail('webmaster@roklubbenfureso.dk', $emne, "", $header)) {
       echo "webmaster@roklubbenfureso.dk OK";
     } else {
       echo "webmaster@roklubbenfureso.dk FEJL";
     }
     echo"<br>";

} else {

 echo"
  <form action=index.php?indhold=211 method=post enctype=multipart/form-data>
   <table border=0 cellpadding=5 cellspacing=0>
    <tr><td><Span style=font-size:12.5pt><b>Emne:</b></td><td><Span style=font-size:12.5pt><input type=text name=emne size=30></td></tr>
    <tr><td align=top><Span style=font-size:12.5pt><b>Besked:</b></td><td><Span style=font-size:12.5pt><textarea cols=50 rows=10 name=tekst></textarea></td></tr>
    <tr><td align=top><Span style=font-size:12.5pt><b>Vedhæft:</b></td><td><Span style=font-size:12.5pt><input type=file name=vedhaeft_fil></td></tr>   
    <tr><td></td><td><input type=submit value=Send!></td></tr>
   </table>
  </form>
 ";
}

håber der er nogle der kan hjælpe