loose referece to "file Manager" Follow

While in the Project tab of PyCharmm I click on a sub folder of the project. The pop-up window offers the option to "Open in" and within that item, "File Manager" or "Path Filesystem".

When I select "File Manager", in my case it should open Dolphin, instead it tries to open the folder with Audociuos, a nice old application for listening to and maintaining audio playlists along the lines of the glorious winamp. Great, but obviously it is not what a need.

I try to redefine mimes user defaults, with no  success.

Is there something inside PyCharm settings that understands this inconvenience?

Thanks in advance!