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Sigil saves to a temp epub first and then physically overwrites the original epub to save extended file attributes on the Mac. Only once the copy is successfully complete does it delete the temp epub in the temp folder.
So since the file copy never completed, there should be a temp version of the epub as a zip file someplace in the temp directory. Unless the reboot caused the temp directory to be wiped. On Mac is typically is not wiped until needed. I am not sure how that works on Windows. So he should find the entire epub as a zip in the Sigil temporary directory on his OS.
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