[DaltonST]

As you know, .opf files are in .xml format. They can be converted from .opf to .csv format by many free tools found in and on the internet.

The JS+ "Import CSV to Update Metadata" tool imports .csv files.

So, if you have "old" .opf files from an older Calibre library back up, you could (if necessary) import the "old" .opf (converted to a .csv) using the JS+ tool to add metadata (that is in the backed-up .opf) to the current metadata...in a very specific, granular, column-by-column controlled manner...with no risk of ruining any currently "good" metadata columns.


DaltonST