[kde] [Bug 449234] I'm getting a code 100 error every time I try to open a directory through a program or my super menu, after switching from XFCE

[Nicolas Fella]

https://bugs.kde.org/show_bug.cgi?id=449234

--- Comment #3 from Nicolas Fella <nicolas.fella at gmx.de> ---
(In reply to Nate Graham from comment #2)
> > Could not find the program 'exo-open'
> 
> This means that your system's file manager is still trying to use some old
> XFCE thing. You'll need to manually reset it by going to System Settings >
> Applications > Default Applications > File Manager > change it to "Dolphin".
> 
> Normally this happens automatically at system installation, but evidently it
> is a manual process when you install the system manually like you've done.

The actual cause is somewhat different. xdg-open calls exo-open when it detects
that it's running on XFCE, and kde-open when it detects that it's running on
Plasma. It does that detection based on the value of XDG_CURRENT_DESKTOP.
Setting that to "KDE" should make things work

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