I found a partial solution. I copied the book directories to a memory stick, took it over the windows computer and the used the add books function from the stick. Calibre kept the metadata and cover along with the book. This kept the date added which was my main concern. I would have happier if the actual order in the new library was kept but this is good enough, at least for now.
The path length limit goes all the way back to DOS and the original version of Windows. Zipping the directories. What is needed is a utility or addon that will create an image of the library and then restore the library in a new location updating the database metadata for the changed paths/filenames. A project that is beyond my programming skills. I'm just an old, retired Pascal programmer.
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