I hope you don't mind that I share here the fact that I just open sourced my File Manager that I mentioned regularly, given I'm also working on porting it to AROS. I'm on macOS so this is the most advanced version, then comes Windows that I can get access to every once in a while. Linux is untested and then comes Aros for which a lot of work is still required to get it into something useful enough. Aros is in a branch if you wanna have a look. Feedback welcome, like always. jkn.me/blog/the-plan-was-a-faster-file-manager

It looks very feature rich and well designed