title_body: E_ADEPT_DOCUMENT_TYPE_UNKNOWN error in fulfilling a .acsm file
upvoted_answer: It happened to me with an .acsm file, but from a different store (it was Kobo); I managed to resolve this problem by downloading the file again, and Adobe Digital Editions was able to import it.
  I don't really know what really happened in the background, maybe some error prevented the creation of a valid .acsm file; I can't guarantee that this will help you, but maybe it is a starting point.
  
  Another possible suggestion, if you can't solve that way, is to get the refund from Google and buy the book from another store (I usually shop on Kobo and on IBS, the latter for the italian market is excellent)
  
  Said that, I highly respect and tend to privilege publishers that avoid all this stupid and bothersome DRM procedure (as a Linux user, I don't have a native solution to run ADE...); a policy that create problems only to paying customers is crap.