Support plugin - upload attachement does not work

I cannot get any attachment uploaded when trying to create a support ticket as a subscriber.

1. First problem is nothing can be uploaded
2. Second problem: I need doc and docx documents to be uploaded.

I saw this code:
$allowed_file_types = apply_filters( 'incsub_support_allowed_mime_types', array(
'jpg' =>'image/jpg',
'jpeg' =>'image/jpeg',
'gif' => 'image/gif',
'png' => 'image/png',
'zip' => 'application/zip',
'gz|gzip' => 'application/x-gzip',
'rar' => 'application/rar',
'pdf' => 'application/pdf'
) );
What do I need to change to accommodate doc and docx?

The website is nitorpublishers.com
I will gladly provide admin access.

Thank you for the help.
Cor