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What does a 'Path' have to do with anything?
If you use the OS to delete books, you have destroyed the integrity of the Library and DB. Calibre no longer knows what formats of books exists.
Calibre deletes books (use the recycle icon)or formats and maintains the integrity.
So if you have been using the OS to delete books, you need to run Library Maintenance (on the Library Right click menu) an resolve the errors.
Books without formats are called 'Empty Books'
People use them to document a paper Library, A wishlist...
To find these books, use the search: formats:false
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