.eps not uploadable

Hi, i would add .eps in media file uploadable
I add this code in functions.php

function my_myme_types($mime_types){
$mime_types['eps'] = 'application/postscript';
$mime_types['ai'] = 'application/postscript';
$mime_types['psd'] = 'image/vnd.adobe.photoshop'; 
return $mime_types;
}
add_filter('upload_mimes', 'my_myme_types', 1, 1);

But after that, if I upload an .eps, Worppress retieve the message “.eps could not upload for security reasons”, yet.

Why?
How can I do?