I'm not sure its 64-bit or simply newer versions of Windows - but this has been broken for everyone for a while; at least since Windows 10. I'm not aware of any workaround.
However, the video format isn't anything complex, its basically an AVI file with an extra header. And there's a simple command-line tool to strip off that header to turn it into an AVI file. Still can't view in game, but can view the videos in the media player of your choice. Tool attached but its been a long-time since I've used it so you may need to consult the readme text file before use.