...and the boot configuration database remains intact, then you should be able to regain access to Windows 8 dual-boot. However, how you go about that is another matter and I'll have to investigate and see what I can find.
If you want to see what the Boot Configuration Data looks like, check out the article Remove Windows 8 from a dual-boot configuration
If you decide to experiment, MAKE SURE that you BACK UP your important data before you do anything.
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