Need MS-PUBLISHER entry for functions mime types

[ Moderator note: moved to Fixing WordPress. ]

Every update I need to insert the publisher file type in functions.php so I can upload a Publisher file for my clients. However, with the new security measures, I don’t know what extensions to enter for publisher. It’s no longer simply ‘pub’ => ‘application/mspublisher’

I’ve tried other things that look similar to the other ms-office extensions, but can’t get it right.

Does anyone know the new ms-publisher extension?