Hi Michael,
thanks for your help. But unfortunately this solution:

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That one is here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=1049.5
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won't work in the way the Windows-based script does.

And the "Mr. Spock"-grip cmd-shift-4 on the mac forces my to rename each screenshot separately.

I'm sure you will fix that problem before sunset ... :-}

Moritz from Germany