Hi John, thanks for the reply.
For some reason, when I opened the Nautilus from a command line today
its colors look OK - maybe the previous time (which, I think,
was the first since KDE install) it didn't get correctly the colors and other
resources and only after closing it something changed.
Anyway, I changed the default file manager from Dolphin to Nautilus
and now I'm able to open folders in separate windows as before.
After that I checked files associations when using Nautilus. The
associations of *.dng and *.tif were not what I want so I went to
System settings -> File associations, changed *.DNG to have UFRaw
to be the default application and *.tif to have GIMP the default
application, re-opened Nautilus, went to the images folder ... and
nothing changed: files associations within Nautilus were unaffected
by the changes I made.
BTW, I just opened Dolphin, went to the same folder - and indeed, the
associations match what I changed. So, it really looks like Nautilus
takes the associations from some another location.
Can anyone explain me, where Nautilus keeps (or takes from) its files