An example of a file that gives the problem
Test2.docx (application/vnd.openxmlformats-officedocument.wordprocessingml.document), 7.74 KB, created by Peter Allott on 2019-04-22 07:58:26 UTC
(hide)
 
Creator: Peter Allott
Created: 2019-04-22 07:58:26 UTC
Size: 7.74 KB

Attachment is not viewable in your browser because its MIME type (application/vnd.openxmlformats-officedocument.wordprocessingml.document) is not one that your browser is able to display.

Download the attachment.

Actions: View
Attachments on bug 124878: 150910