Quote:
Originally Posted by Lynx-lynx
Okay, I've just cracked it, thanks everyone
This is what I did - and now I have the formerly kepub only ebook as an epub in Calibre:
1. As Peter advised above, I went to the following folder/file on my PC:
C:\Users\user_name\AppData\Local\Kobo\Kobo Desktop Edition\kepub
2. In that folder I noticed that all the kepubs had the same file date modified, today's date, which is, I assume, because Kobo Desktop re-loads them each time it's opened.
3. So I started with the first and last files and renamed them .epub. That is, I just added the extension .epub onto the end of the existing file.
4. Then I imported the files, one at a time, into my Sony Reader for PC which is my pre Calibre library for all epub books.
5. My book wasn't the first book, it was the last book - which I guessed means that the last book showing on that file listing is the most recenlty purchased.
6. I opened the book in Sony REader for PC and it was operating sort of slowly - but working and looking like it totally should look. Yippee
7. I imported the now epub book into Calibre, where Alf did it's thing, and opened it. It works perfectly
Yipppeeee ...... 
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It's good to know that Kobo did not add drm to a book that was supposed to be drm free. The solution was pretty much like working with other O'Reilly books where you had to replace the zip extention with epub to get them onto the next device.