Keyboard shortcut to open the selected item

I use Alt+Up to go to the parent folder and I'd like to use Alt+Down to Open the selected folder or file, but there seems to no command for "open folder" or "open file", am I missing something obvious?

Of course Enter key does all that, but just wondering whether this is configurable in DO.

A function that consists simply of {f} will run the selected file.

Thanks. That helped!
A user defined command plus a hotkey, easy. :grinning:

You can put {f} directly into the hotkey without the need for a user-defined command.

Works like a charm. Cheers!