Microsoft's brain-dead default of "hide file extensions" is cited in the article as part of the social engineering aspect that gets users to click on the files. It's the gift that keeps on giving... to black hats.
Hiding the file extension does NOTHING to make things easier on the user or make the UI any cleaner. It's not like we have 40 column displays where the file extension is "too long" and going to take away "screen real estate".
This has been going on literally for DECADES NOW. How can Microsoft be so blind? Whenever I get a new Windows box, it's the first thing I disable because if I don't, I'll just end up creating files with names like, "DailyLog.txt.txt".
Whoever is at MS, insisting that this remain the default needs to be hauled out, shot, drawn, quartered, and the pieces sent to be displayed in the lobbies of their 4 largest offices.