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An ACSM file is not an ebook, it is an Adobe Content Server Message file. It tells your computer how to download the book, whether it is a purchase or a loan, how long the load period is, etc.
You will need to use ADE or add the ACSM plugin to calibre to be able to download the ePub that the ACSM file is pointing to. You will also need to add a DRM removal plugin to calibre but that topic is not open for discussion on MobileRead.
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