сейчас так работает с nodm
prefdm (application/octet-stream), 1.81 KB, created by YYY on 2018-09-28 12:05:00 MSK
(hide)
 
Creator: YYY
Created: 2018-09-28 12:05:00 MSK
Size: 1.81 KB

Attachment is not viewable in your browser because its MIME type (application/octet-stream) is not one that your browser is able to display.

Download the attachment.

Actions: View
Attachments on bug 35452: 7790