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Message: <blockquote data-quote="chscag" data-source="post: 1594022" data-attributes="member: 46727">The Microsoft Windows 8.1 DVD probably contains both the 32 bit and 64 bit versions, however, I have no idea what their download consists of.  But as you found out, you can not use a 32 bit version of Windows with your Mac as it's not supported.  I would call MS support again and make sure they direct you to the 64 bit exe download.  I'm fairly certain from remembering the difference between the 32 and 64 bit versions of Windows 7 that the 64 bit version exe of Windows 8.1 will be a larger file.Also... an exe file has to be executed (run) in order to obtain a bootable iso.  You can not place the exe file on the flash drive and expect it to be bootable; it is not.</blockquote>