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This is kind of expected behaviour. .DS_Store files are MacOS folder metadata files. They are meant to be hidden from MacOS users. They are created inside every folder a user on MacOS opens in the finder for any length of time.
My guess is a MacOS user used FolderIn and FolderOut to work on an epub with tools outside Sigil or to add it to a github version control system. So it accidentally got scooped up and pulled in by FolderIn.
It is always safe to delete it from an epub (and even safe to always delete it on MacOS) but because it starts with a period, most folder file iterators will ignore it.
The one for plugins sees it but Sigil or the plugin does not properly delete it.
I will look into why when things slow down a bit.
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