This really bugs me at work sometimes. I’m a designer and I often have to split up images in several mails because others don’t understand the concept of archives. Or even worse: send the photos as “excel image file” (slapping them all in a excel sheet). I even once had a printery tell me my file was corrupt because it was (accidentally on my part) compressed as 7z. Oh how I would love to send files more often as 7zip… But that’s black magic apparently.