Make configurable which system file explorer to use

[HelioGuilherme66]

For example in Linux, currently the search is done by Dolphin and Nautilus, but user may be in a Linux that does not have any of those or may wish to use a different one.

Example:

Environment	File Explorer
LXQt	pcmanfm-qt
---------------	-----------------

[ksokolowski]

Hello. Could we also configure which browser to use for opening logs? IMO it is similar issue, that could be done as part of the same enhancement.