To view and play HEVC encoded video (also known as H.265) in ACDSee, please install HEVC Video Extensions from MS Store to enable the HEVC support in Windows: https://www.microsoft.com/en-us/p/he...ot:overviewtab

After that, you can play the HEVC (H.265) encoded video file in Windows media player, as well as in ACDSee.