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ACSM isn't a book format by and of itself, it's a kind of ticket file you can download your Adobe-DRMed EPUBs with. You need Adobe Digital Editions or the recent ACSM input plugin to do that (the ACSM input plugin will also strip the DRM in one go).
Even so, upgrading to the latest DeDRM is a good idea, even if it won't solve this specific issue.
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