I tried out my clever (!) idea to change the name of the Windows-folder:
in which the Help-installer had put the Dutch Help-version from "nl" to "en".
And tweaked nothing else than the Preferences - Help panel:
Now the "Help"-buttons and F1 produce no longer an error. They start a
browser-window and display there the Help, in the mixed English/Dutch version
it is actually in, that is more or less relevant for the context in which he
HELP-button or F1-key was used. Sometimes it seems to be necessary to center
the focus on a specific detail.
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