I just downloaded two of emanuele's attachments that I really didn't want to because I thought they were previews.
Instead of downloading the attachment when you click it, it should give you a preview as a lightbox/modal. That modal should contain links to download and view the originating message.
BTW, I really like that feature and really like the chosen icons.
Good point on those, they should act like they would under a post and have a link back to the post as well. Should add this to github as a feature request so we remember :D
For anyone not familiar with those, when you view a users profile and select their "recent activity" tab, in that listing are the recent attachments they have posted. You will see an image or icon if its a know mime type.