I was looking for a program that would allow me to view HEVC in thumbnail view and found that the updated version of a program that I already had would allow me to do this. A couple of other programs said that they supported HEVC but I could get neither to work.
Media Preview 1.4
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I couldn't find any changelog when it was released 5 days ago but it has been updated on the developer site now
Added support for H.265/HEVC and VP9 codecs
Have you tried latest icaros?