I see RAR files quite often when I get bundles of LaTeX files from Chinese scientists. Apparently, there's a free Chinese version for some reason. Although I still have no idea why they don't just use the universally accessible ZIP format – as far as I can tell, RAR offers no advantages at all. I just use 7Zip to deflate them and send them back a normal ZIP in the hope that they'll get the message.
Biting the hand that feeds IT
