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That file that you saved from Kobo is most likely the acsm file.
It is NOT the book. It is a "key" to authorize you to download the book
You need to set your computer to choose "Adobe Digital Editions" as the program that will open that file. You don't want to save the acsm file to your computer, you want to open it with Adobe Digital Editions. Adobe will then take that ACSM file and use that to retrieve your book for you.
Once you have the book as viewable in Adobe Digital Editions then you can load it into Calibre like usual.
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