#28 download option is not working

[Anonymous]

transfer--->download

option is not working with file manager but when i
chnage some code in header section... it start workiing

here is the peice of code
*****************************************

if( strstr($HTTP_USER_AGENT, "MSIE 5") && !strstr
($HTTP_USER_AGENT, "Opera"))
{
header("Content-Type:
application/RFC822");
header("Content-Length: ".filesize($dw));
header("Content-Disposition: attachment;
filename=".$file);
}
else
{
header("Content-Type:
application/octet-stream");
header("Content-Length: ".filesize($dw));
header("Content-Disposition: attachment;
filename=".$file);
}v