Quote:
Originally Posted by rdsk
Please tell me if there is anything I can do to convert to pdf this more complex file structure - in Calibre or other software - and what the different file types are eg the voucher file.

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The presence of a voucher file indicates that this book is in KFX format. You cannot convert KFX format from newer versions of Kindle for PC because it uses a new type of DRM.
See the notes under Method 2 in the first post of this thread for information on how to disable KFX so that you can get the book in a format that is able to be converted.