Hi DennisDennison1 and thanks for reaching out. My name is Joseph. I'm an independent advisor. I'll be happy to help you out today.
It is just an extension/codec that installed on your Windows 10 to be able to play HEVC or H.264 video format using the default video player installed on your Windows 10 PC.
Play High-Efficiency Video Coding (HEVC) videos in any video app on your Windows 10 device. 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. 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 also let you encode HEVC content on devices that don’t have a hardware-based video encoder.
https://www.microsoft.com/en-us/p/hevc-video-ex...
I hope this helps. Feel free to ask back any questions and let me know how it goes.
Thank you!