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The opf file is not an ebook file. It is a metadata file. It contains all the metadata like title, author etc that is stored in the database about the book. An OPF file is always saved no matter what ebook formats are available. The recommended workflow for converting books is:
1. Click add books and select a book to add. This causes the book to appear in the list of books. The database now has its own copy of the ebook file.
2. Select the book and click edit meta information. CHange any meta information that needs to be changed. Ignore the available formats box. Click OK.
3. Select the book again and click Convert and then OK. Once the conversion process finished (hourglass stops spinning), your LRF will be ready to fo.
4. Select the book again. Click save to disk. Now there will be at least 3 maybe 4 files. One is the original ebook file. one is the converted LRF. one is the opf with metadata. There may also be a cover image.
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