File download problem using Netscape 7.x

Hello, I have some files on a website which the user can download (e.g. pdf, zip...). The files sould not bw displayes but the browser should aks the user what to do (e.g. save it to disk, open it). My code look like this: header("Content-type: application/octet-stream"); header("Content-disposition: attachment; filename=$userfile); header("Content-Length: ".filesize($userfile)); header("Content-Transfer-Encoding: binary\n"); if($fp = fopen($userfile, "rb") fpassthru($fp); This works fine in most browsers except Netscape 7.x. Here the file is saved as "document.pdf.php" instead of "document.pdf". Does anyone know how to fix this? Any help is appreciated. Yours, Uli