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Since a kepub is simply an ePub with added spans, you should be able to open one with any ePub reader applications. That's why under Windows, you see the two part .kepub.epub file extension which most programs will only use the last part of and see them as epubs. calibre is about the only program that stores them as .kepub without the .epub so you can have a kepubified version of the the ePub stored in the same folder.
When sending to a Kobo device, calibre will automagically change the extension from .kepub to .kepub.epub.
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