The kePubs are apparently located in the .kobo/kepub folder. They do not have filename extensions and the filenames give no hint as to which book it corresponds to. For example, one of my kePubs has the filename of 3c0d94ad-50d2-42f0-a0be-2141b2e14e19. That book's title is A Tale of Two Cities by Charles Dickens, a KoboBook free book BTW. I was able to copy this one to my PC, give it an epub extension, then double-clicked it and it opened in the Sony Library application.
You are probably wondering, what if I sideload an ePub into the .kobo/kepub folder and delete its ePub extension, will it open in the kePub engine rather than the Adobe ePub engine? Nope. I tried but it didn't show up in the library when in this folder, with or without the ePub extension.
Sidloaded books (ePub, mobi, PDF) are placed in the root.
Last edited by jswinden; 07-06-2011 at 08:45 PM.