Description:
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I included a file into my script, and soon found that since that file was a UTF-8 encoded file which means that at the beginning of the file, is a UTF-8 BOM code sitting just before the ...<?php ?> tags, and that the information which is sent with Content-Disposition: attachment;, and no matter what my Content-Type: application/rtf; charset=iso-8859-1//TRANSLIT says, the downloaded content turned out to be UTF-8 instead of ANSI. The string itself was entirely ASCII. What needs to be changed is that BOM code needs to be filtered out of the content, thus ensuring that the content-type can be honored. In order to recreate this scenario, simply change the include.php files' encoding to UTF-8, and use the code mentioned below. And once you save the file sent from the web server to you system, you to will find that the content is UTF-8.

Test script:
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<?php
include_once('include.php');
$rtf = 'Testing';
header('Content-Type: application/rtf; charset=iso-8859-1//TRANSLIT');
header('Content-Disposition: attachment; filename="' . '10-Jane-Doe' . '.rtf"');
header('Content-Length: ' . strlen($rtf));
header('Expires: Fri, 01 Jan 2010 05:00:00 GMT');
header('Last-Modified: ' . gmdate( 'D, d M Y H:i:s' ) . ' GMT'); 
header('Cache-Control: private, must-revalidate');
header('Pragma: no-cache');
ob_start();
echo $rtf;
ob_end_flush();
exit();
?>

Expected result:
----------------
I would expect the web server to honor the Content-Type of the string and the web browser honor the Encoding of file being downloaded, and not have php push content  not part of the string into the output buffer.

Testing

Actual result:
--------------
Testing is being downloaded into the rtf file, thus causing the file to be UTF-8, and then causing the file not to rendered properly with LibreOffice.