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#11
Unfortunately the HEIF Image Extensions are only the first half of what you need, you cannot open .heic without the HEVC Video Extensions also being installed. That is the part of the HEIF/HEVC bundle that costs $0.99, or when bought on its own.
HEVC Video Extensions
Up to a month ago there was a free version called 'HEVC Video Extensions from Device Manufacturers' but that is no longer available, as this link now says.
HEVC Video Extensions from Device Manufacturer
And confirmed by the How-To Geek here:
How to Install Free HEVC Codecs on Windows 10 (for H.265 Video)Update: As of October 2020, it looks like this free package is no longer available.
I'm afraid the only version currently available is the $0.99 one