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Stymied, again.
These are the steps I took and their apparent failure.
1. Created a new empty library.
2. Searched on format = zip, rar
3. Used copy to library to migrate the zip, rar files to new empty library
4. Ran batch files to unzip all files using 7-zip, verified complete
5. Deleted all zip, rar files. Verified no zip nor rar files remained.
6. Checked the books, via Calibre, and they still showed format = “zip” or “rar” despite everything. When I clicked to open, the folder showed the correct eBook, HTML, or PDF file.
7. I tried adding the books to a new empty library, hoping that would clear the format error. It didn’t.
8. Also tried library metadata backup, hoping that would correct the entry. It didn’t.
9. The worst bug - I changed metadata (author) on one of the unzipped files, saved it, and the text vanished from both folders (old and new author name). All that remained were metadata.opf files.
I did a search of the whole library folder, and that particular text file was erased !
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