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dbareis,
If you are trying to customize calibre's internal file structure, then absolutely nothing will (or should!) work for you. Calibre's file structure cannot be altered, otherwise data will be lost.
Nor should you be using or manipulating these files outside of calibre. Calibre's copies of you ebooks are just like a jet plane's black box - data goes in, nothing touches the data inside. This is done intentionally, as otherwise other program(s) can alter the files and corrupt calibre's data.
I think everyone reading your first post above assumed you were exporting ebooks from calibre to another device - a smartphone, laptop, ereader, etc. Some other physically separate device/system. Not the computer on which calibre is installed.
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