Mount the .vhdx file under a Windows 8 VM and then use an imaging tool to create an image you can restore to a .vmdk file or image it directly to a mounted .vmdk. You do not need to have Hyper-V running just to mount the .vhdx file in Windows 8. BTW I did this in a Windows 8 Enterprise VM that I created from the Windows 8 Enterprise Trial downloaded from Microsoft.
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