When a default action application is set in FC for a certain extension (e.g. *.jgp) and the active folder has diacritics in its name, pressing ENTER will trigger an error message.
On the other hand, for the same extension (e.g. *.jpg) and the same folder, editor (F4) and view(F3) work just fine.
All these 3 options are available in Settings -> Programs -> (editors | viewers | default action)
