The acsm file is kinda of like a license that allows you to download the epub/pdf ebook. Opening an acsm file (do not save it) will open the ebook and automatically save it to your computer. When you get books from the library it is easier to open the book rather than save it.
Any epub or pdf borrowed from the public library will not be readable on your K3. One would need to remove the DRM and convert (for epubs) for the K3 to open the ebook.
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