>HEVC windows 10 app
Unless you can link to the specific "HEVC windows 10 app", I'm pretty sure you're referring to "HEVC Video Extensions", which is just a codec pack for decoding HEVC files.
>DV app is called Dolby Vision Extensions app
The linked article says that you need a "Dolby Vision licensed device"? That suggests it might need some sort of calibration for it to work?