Kepub books (that is ePUBs in the proprietary Kobo format) are in your appdata folder, with an address something like this: C:\Users\myname\AppData\Local\Kobo\Kobo Desktop Edition\kepub
If your non-kepub book also does NOT have Adobe DRM (is a drm free ePUB) then it may be in your download folder.
I am not sure what you are really asking though, so maybe try rewording your question...
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