http://www.mulle-kybernetik.com/artikel/MulleFaBVisualizer/

Nifty tutorial / example project / walkthrough that covers all you ever wanted to know about NSViews, bounds, frames, scaling and rotation

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I can not open it, even with gnutar. I get:

gnutar xfz MulleFaBV-osx-1.0.tar

gzip: stdin: not in gzip format gnutar: Child returned status 1 gnutar: Error exit delayed from previous errors

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Then how about contacting the original author?