In MacOSX, the file Sojourn 03-0203.jpg (pages 2 and 3) comes after Sojourn 03-22.jpg (page22) making the the story jumpy and hard to read.
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This is a feature, not a bug. The first image is treated as page 203.
The behavior is the same for Jomic, the Mac OS X Finder and the Windows Explorer.
I updated the FAQ, see <http://jomic.sourceforge.net/faq.html#why-wrong-image-order> for a more detailed explanation.