Кирилица и пробелы в пути и имени файла. GET запрос

<a href="download.php?file=D:/тест б/по русски.docx">Русский путь</a> |
<a href="download.php?file=D:/test/test.docx">Eng путь</a> |

$file = $_GET['file'];
  if (ob_get_level()) {
  ob_end_clean();
  }
  header('Content-Description: File Transfer');
  header('Content-Type: text/html; charset=utf-8');
  header('Content-Type: application/octet-stream');
  header('Content-Disposition: attachment; filename=' . basename($file));
  header('Content-Transfer-Encoding: binary');
  header('Expires: 0');
  header('Cache-Control: must-revalidate');
  header('Pragma: public');
  header('Content-Length: ' . filesize($file));
  readfile($file);
exit;

Warning: filesize() [function.filesize]: stat failed for D:/тест б/по русски.docx in X:\home\localhost\www\local\url\download.php on line 16
 
Warning: Cannot modify header information - headers already sent by (output started at X:\home\localhost\www\local\url\download.php:16) in X:\home\localhost\www\local\url\download.php on line 16
 
Warning: readfile(D:/тест б/по русски.docx) [function.readfile]: failed to open stream: No such file or directory in X:\home\localhost\www\local\url\download.php on line 17