Yet another step reveals the locus of the problem here at least:
(11) try to run 'klauncher' from CLI : "must be started by Kdeinit";
(12) restart in KDE, fix Krusader + Apwal ;
(13) reboot & restart FB but without 'kdeinit &' in ~/.xinitrc :
Krusader 'open with' ok !
So my problem seems to lie in starting 'kdeinit' without the KDE desktop.
It will take another couple of reboots (tomorrow) to confirm this.
Mick mb doing things a bit differently & his problem mb elsewhere.
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