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.