note 32795 added to function.header

HI, i have a problem, when i try to download a file from my server (IIS) this file it's save on my hard drive, but the file is modified , it' no longer the same file that i used to have, the code that i have know is <? ob_start(); i must have this line to dont have any error after ?> if i delete this line after i have the error that says that i can not modify the headers.... <? $filename0 = $_GET["file2dl"]; // single filename Header("Content-type: application/force-download"); header("Content-type: application/octet-stream"); header ("Cache-control: private"); $fp = fopen('../'.$filename0, 'r'); fpassthru($fp); ?> what can i do? thanks ---- Manual Page -- http://www.php.net/manual/en/function.header.php Edit Note -- http://master.php.net/manage/user-notes.php?action=edit+32795 Delete Note -- http://master.php.net/manage/user-notes.php?action=delete+32795&report=yes Reject Note -- http://master.php.net/manage/user-notes.php?action=reject+32795&report=yes