That, unfortunately, I can't explain. We do copy all the attributes that are associated with the file, but it's possible that something strange has happened with Tiger's changed handling of this stuff.
We'll take a look -- but, in the meantime, I wouldn't worry too much about it. Apple's changed this hidden-folder handling a large number of times over OSX's life, and I'm sure they'll change it again. What's really important is that it's copied with its proper permissions, etc.
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--Dave Nanian
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