I would suggest contacting the store that you purchased the ebook from. They should not be handing out ACSM files that have a PDF or EPUB extension after them. Most ebook reading applications check the file extension and mime type to determine if they can handle the file you are passing to them (which is why bluefire/overdrive do not open this file for you unless you remove the extension). Ebook reading applications in this case, are only expecting ACSM extensions and the store you purchased from is not following conventions of the ecosystem.
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