It's a fair question. I suspect the developer (Alex) needs to revisit viewing packages as a single file. It looks like it doesn't do this by default.
On a Mac, File Explorer shows Pages documents just great, PDFs too. But, it shows RTF or Rich Text files in a folder with a sub document. I would prefer to stay in RTF but as long as this is the way it is in Freeter I have decided to use Pages format instead.
It would be nice to see this corrected at some point.
On the Mac side, it would be helpful if Quickview worked in Freeter. If you're not a Mac user, Quickview is a mac standard feature in most apps where you hit the spacebar with an item selected and you see a preview of the document. I use screen resize macros so I often do this and hit the screen resize macro to make my Quickview window full screen. Then I can arrow up or down and see each file fullscreen as a preview in near real time.
Quickview can scroll to read the whole document. They can launch apples standard preview app, but they are not the same as a PDF editor. That is, you cannot mark on them, you can only read.