PHP form with upload file

I am running some PHP pages on IIS 6.0. I have created a form that allows
the user to fill in some data and attach a file such as a pdf. When the
user presses the submit button, the information the user filled in on the
form is emailed me with the attachment. All the information comes through
just fine, however the attachment has an error:

Error message as follows: Acrobat could not open 'test.pdf' because it is
either not a supported file type or because the file has been damaged (for
example, it was sent as an email attachment and wasn't correctly decoded).

Here is the code I am using:

//Attachment Start
$fileatt = $_FILES['fileatt']['tmp_name'];
$fileatt_type = "application/octet-stream"; // File Type
$fileatt_name = $_FILES['fileatt']['name'];

$headers = "From: ".$from;

$file = fopen($fileatt,'rb');
$data = fread($file,filesize($fileatt));
fclose($file);

$semi_rand = md5(time());
$mime_boundary = "==Multipart_Boundary_x{$semi_rand}x";

$headers .= "\nMIME-Version: 1.0\n" .
"Content-Type: multipart/mixed;\n" .
" boundary=\"{$mime_boundary}\"";

$message .= "This is a multi-part message in MIME format.\n\n" .
"--{$mime_boundary}\n" .
"Content-Type:text/html; charset=\"iso-8859-1\"\n" .
"Content-Transfer-Encoding: 7bit\n\n" .
$message . "\n\n";

$data = chunk_split(base64_encode($data));

$message .= "--{$mime_boundary}\n" .
"Content-Type: {$fileatt_type};\n" .
" name=\"{$fileatt_name}\"\n" .
//"Content-Disposition: attachment;\n" .
//" filename=\"{$fileatt_name}\"\n" .
"Content-Transfer-Encoding: base64\n\n" .
$data . "\n\n" .
"--{$mime_boundary}--\n";


//Attachment End


thanks!

Christian



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