@jPV, @Kronos:
Ah, I see. I just expected that after selecting any part of the file, I would see a context menu for that file. But that's not a problem. I can definitely live with it. :)

Ambient is still the best solution available on MorphOS/AmigaOS. I really enjoy using it. It's hard to believe the long and challenging development journey it has taken to reach its current state.
Thanks for your answers.