Recently I wanted to send someone few files zipped with password and I know that this person uses Windows and has 7zip installed. So I pressed "Compress...", selected 7zip and... was not able to type password, without any explanation, textbox was just greyed out. I knew that 7zip format supports password protection, so I was surprised, that I can't do so. I had to google out what's going on and learn that I need to install P7zip-full. It's great that P7zip is installed in Linux Mint out of the box, but in my opinion P7zip-full should be installed out of the box as well.