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Use Metadata bulk search and replace. Select all the books you want to change, press 'E' to open the bulk metadata editor, click the Search and replace tab, then fill it in as shown by the screen capture.
To help with typing, the Search for field contains "(^.*$)" (no quotes) and the Replace with field contains "\1".
This might take a while because it will rename folders in your library.
Please have your library on a local disk, not a networked device. This is the kind of operation that triggers catastrophic failures on network devices.
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