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locate the folder than has your files that Kindle for PC stores your books in. Then open the folder with windows explorer or other file manager, and select the books and drag and drop them into calibre or use calibre's add book tool and point it to the folder than has the Kindle for PC books in it, but you have to understand that in that folder is also the other files that Kindle uses to keep up with location in the book as well as bookmarks etc.
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