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ltr is correct. The kepub books (those loaded onto your book from the Kobo desktop application) are in a DRM format not supported by Calibre. They show up in your directory as a long string of numbers and letters. Just for giggles, I added an ePUB file format onto one of them and tried to open it in ADE--the only thing that happened was that the name of the book and its author briefly showed up in the ADE application, but it did not import. It was also not readable/usable in Calibre when I did that.
Fortunately if the book is available in ePUB format, Kobo will almost always have that format available.
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