Thank you Jackie!
That was very helpful and exactly what I was looking for.
The box in the prefs is now unchecked (and it cannot be checked manually, still)
Hint for Mac users stumbling upon this:
to see "hidden" items on your Kobo, start the "Terminal" app (it's hidden in your Programs -> Utilities folder).
then type (cut and paste the text in italics): defaults write com.apple.finder AppleShowAllFiles 1
Now you can see the hidden files.
Edit as described by Jackie, use the "TextEdit" app, also hidden in your program folder.
Once saved (make sure you check under the format menu the the text is without formatting), you can set your finder back to its default setting so the hidden files do not show up any more.
Cut and paste the italic text into the "Terminal" app window: defaults write com.apple.finder AppleShowAllFiles 0
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