VideoStudio: Unable to play video files (HEVC / H.265) in VideoStudio

You might experience issues playing MPEG-4 (MP4) files encoded in the HEVC (H.265) format if you are using the Windows 10 Creators Update. The HEVC video extension is not included in Windows 10 Creators (was included in previous releases of Windows 10).

To fix the issue, you can install the HEVC video extension from the Microsoft Store:
https://www.microsoft.com/en-us/store/p/hevc-video-extension/9n4wgh0z6vhq?SilentAuth=1&wa=wsignin1.0