This is a short tip from the wiki (and most of the notes here will come from the wiki)
After some time, I found quite annoying the way Aquamacs manages frames and windows when I use it as a filemanager (which is something Emacs is really good at) — in fact this ain’t a problem, since I rarely use it that way and I can quickly change behavior with a menu toggle –.
If you would like it to behave like “traditional Emacs” you may want to read this tip
Since I was speaking about dired mode, I add it here: another tip. With this you can open files using mac os open command.