The HEVC Video Extension enables compatible Windows 10 devices to play video using the HEVC format in any app, including 4K and Ultra HD content. Compatible devices support HEVC in hardware, including Intel 7th Generation Core processors and other modern GPUs. If you are not using a compatible device, this extension will have no effect on your Windows 10

残念
スマホで撮った H.265 動画は「映画＆テレビ」では相変わらず音声のみ、映像は表示できない。