---------------------------------------------------------------------------Hmm, it actually makes sense then! Not too long ago I switched to The Unarchiver because Stuffit Expander was acting up when it came to unraring password-protected files. But here's the thing: I've found the ._.DS_Store file even in some folders that were never extracted/compressed!
i don't know how that occured but my money is still on 'The Unarchiver' for creating them.
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---------------------------------------------------------------------------Btw, I just tried to compress a music album/folder by right-clicking on it and selecting "Compress" and then unzipped the file with Unarchiver again - but it did NOT create a ._.DS_Store file though.
if you were to test a few times with mp3 files,( i.e.) sooner or later a song named 'Against The Wind.mp3' would have an invisible friend named '._Against The Wind.mp3' created by The Unarchiver.
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---------------------------------------------------------------------------I have a feeling that it only creates it with RAR files (though not all of them). Also, I've noticed that in some of my music folders where aside from mp3s I also keep a jpg cover of the album, there is also a ._name-of-that-jpg-pic hidden file in there - which will also prevent the folder from being copied to a USB key (even if there is no ._.DS_Store file in there)..... I'm totally confused about all this crap.....
i suggest you trash The Unarchiver and d/l EasyFind. then search your Volume for ._. files.
select all and right click on EasyFind's window and choose Destroy.
all these ._. files are just useless crap.
keep in mind that snow leopards Finder is different and we now have 2 'com.apple.finder.plist' files...
~/Library/Preferences/ com.apple.finder.plist
/System/Library/LaunchAgents/ com.apple.Finder.plist