Quote:
Originally Posted by slm
For some ereaders, you may have to rename the file so that the name ends with ".epub"
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For all ereaders. A Kobo ereader needs the .kepub.epub file extension. The only exception is if you have books synced from Kobo in which case there is no file extension and a file name that looks like a GUID ( 97affd0c-f2e4-46d8-aa18-c36b00a8cff9 for example).
The only place a .kepub extension works is in the calibre library, neither calibre's ebook viewer nor ebook editor will open them. When the Kobo Touch driver is used, the file is renamed to .kepub.epub when transferred to the ereader.