In a 42.2 , XFCE Desktop, Konqueror cannot doube-click to open;

- video files ( mp4)
- office files ( odt, ods )
- pdf
- txt files ( message KDEInit could not launch /usr/bin/kate )


Double clicking on a jpg, png files , opens that file inside konqueror itself.

Note1: Right-clicking on a file and choose an app to open in does not work for all types
of files.

Note2: Dolphin works fine however.

Q : How do i get konqueror to open files by double-clicking on them ? or right-clicking on them ?