You might be facing this issue in IE “Adobe Acrobat could not open because it is either not a supported file type or because the file has been damaged” off course that’s why you are here.
There exist a plenty of headers that can be included to make your forceful download workable in IE, I have gone through several and mentioned those in reference below.
But the solution that worked from me is extremely simple. (PHP code)
$filename = $this->paramfile;
header(“Content-Type: application/octet-stream”, FALSE);
header(“Content-Disposition: attachment; filename=”.basename($filename));