The ACSM file indicates there's some kind of a download error or server error. What you are really supposed to be getting is a zip file with 3 DRM-free formats (PDF, ePub, Kindle). If you haven't already done so, please contact support at:
https://hub.wiley.com/community/support/wrox
and they'll get the error resolved and get you the file.
BTW, support is staffed even on weekends while the forums are a little more "help each other" and "help when you can."
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Jim Minatel
Associate Publisher, WROX - A Wiley Brand
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