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mikevm
The EPUB won't open in Adobe Digital Editions (on Windows). I opened it as a ZIP file instead, and it seems like it is probably meant for iBooks only.
feifan
That's possible…downloaded from iBooks, pulled from the depths of its library and shared on Dropbox for everyone's convenience :P Sorry about that
jamestomasino
Opens fine in Calibre for converting to other formats. Thanks!
jasomill
Try removing the leading "881256329.epub" from the paths in the linked ZIP to create a (potentially) valid EPUB. If you still have problems after pruning the leading directory, you might also try a ZIP utility that doesn't create an extra __MACOSX directory in the ZIP file to store OS X-specific metadata.

In particular, I can confirm that the file created by running

    zip -rqX ~/path/to/Swift.epub .
from within

    ~/Library/Containers/com.apple.BKAgentService/Data/Documents/iBooks/Books/881256329.epub
after downloading on OS X iBooks works fine without conversion in Google Play Books on Android 4.4.
dfc 

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