These extensions also let you encode HEVC content on devices that don’t have a hardware-based video encoder. For devices that don’t have hardware support for HEVC videos, software support is provided, but the playback experience might vary based on the video resolution and PC performance. These extensions are designed to take advantage of hardware capabilities on some newer devices-including those with an Intel 7th Generation Core processor and newer GPU to support 4K and Ultra HD content. See the developer wiki for instructions for downloading and building the source. Play High Efficiency Video Coding (HEVC) videos in any video app on your Windows 10 device.

Taken from the Microsoft Store the app is described as: You can download the free CODEC App from the Microsoft Store by following this link. Unfortunately you can not search for the App in the store, but need to link directly to it as it is usually provided only to OEM builders, and Microsoft would rather you purchase the $0.99 App, rather than use the free app. The App on the Microsoft Store is called the HEVC Video Extensions from the Device Manufacturer. The advice from Barnacules was a real godsend and is very helpful. x265vfw is a H265/HEVC video encoder/decoder codec for Windows, based on x264vfw and x265 library, usefull with VirtualDub.

X265 codec windows 7