If you can see the attachment icons, the attachments are there. You need to change the viewing mode of the .eml to the “text alternative”. Right above the .eml preview you’ll see this little toolbar. Click the one I’ve circled in red to toggle between the “text alternative” view and “best alternative” (the standard .eml display).
In “text alternative” you can double-click the attachment to open it in its native editor (Word, etc.)
(Yes, you’re thinking, this is really clunky, and you’re right. It’s about time for DEVONtech to consider redesigning the handling of email and attachments.)