--- filemanager.module	2007-12-21 14:12:46.000000000 +1100
+++ filemanager.module	2007-12-21 14:14:56.000000000 +1100
@@ -577,7 +577,8 @@ function filemanager_transfer($file, $wo
   $default_headers = array(
     'Content-Type: '. $file->mimetype,
     'Content-Length: '. $file->size,
-    'Content-Disposition: attachment; filename="'. $file->filename .'"'
+    'Content-Disposition: attachment; filename="'. $file->filename .'"',
+    'Expires: 0', 'Pragma: cache', 'Cache-Control: private'
   );
 
   if ($file->private) {