Thank you for this quick response, Shakiru. I do appreciate it!

I was under the mistaken impression that a subscription to Microsoft OneDrive was a substitute to purchasing Mircrosoft Office for my laptop and therefor allowed me the full capabilities of Microsoft Office. Now I'm wondering what is the benefit of OneDrive.

Thank you for clarifying things for me, Shakiru.

Ingrid

After many years, I got same problem, and after searching, I got here again ))

This is solution, that worked for me:

$file = "somefile.xlsx";
// define file $mime type here
ob_end_clean(); // this is solution
header('Content-Description: File Transfer');
header('Content-Type: ' . $mime);
header("Content-Transfer-Encoding: Binary");
header("Content-disposition: attachment; filename=\"" . basename($file) . "\"");
header('Content-Transfer-Encoding: binary');
header('Expires: 0');
header('Cache-Control: must-revalidate');
header('Pragma: public');
readfile($file);