@DanCa - If you're using Windows you could create a shortcut (.LNK file) to the PDX folder and drop that into the main book list. Then when you click the Title calibre will open the PDX folder, then you can read it with your PDX viewer
This does not break the calibre library structure, you can enter data into the metadata just as you can for any other book, but you wont be able to do tasks like conversions, send to device, save to disk etc.
BR
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