When you're using the Sony Ebook Library Software, and you have a book open on the screen, you can click on the information "i" icon it'll show you the location (path) where the book is stored on your computer and the computer name of the file. The "i" icon is in the upper right hand corner of the reading pane in version 2.5 of the software...not sure if it's in the same location in 3.0 or not.
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