This error means you are running a Windows N edition, which ships without the media-related binaries — mfreadwrite.dll is part of the Media Feature Pack, and it is not present on N editions by default.
To fix it, install the missing pack:
- Windows 10/11: go to Settings > Apps > Optional features > Add an optional feature and install the Media Feature Pack, or download it directly from the Microsoft Support page.
After installation, restart the machine and the application should run without the missing-DLL error.