When you download direct from the device you get a "kepub" - which is really just an epub with a bit of extra code. However it is different from what you get if you use ADE to get the epub from an ASCM file.
I think the crucial difference though is not so much the file itself as that Kobo's firmware uses different software to render kepubs v epubs. There are features that are only made available by the kepub software.
So what you need is a kepub file. One way to get that is to deDRM and convert using Calibre - hence Sirtel's suggestion. I *think* the Kobo PC app method would end up giving you a kepub so that might be the way to go.
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