Zend certified PHP/Magento developer

Extension with a native client – adding PATH doesn’t work

https://imgur.com/a/1UzQ2fy

crosspost from stackoverlow. Noob in many ways

I’m kind of way in over my head here, as I just wanted to install an extension on Firefox, but I really want this to work and I don’t know where to start.

The extension works with MPVplayer. When installing, I get the error:

Make sure it is installed and in your path…

Someone suggested to add the whole mpv folder to path and I did… like this:

Variable name: mpv

Varibale value: C:Program Files (x86)mpv

It didn’t work. What do I do?