Microsoft Validation OS

Microsoft Validation OS is a lightweight, fast, and customizable Windows 11-based operating system that you can use on the factory floor to diagnose, mitigate and repair hardware defects during Windows device manufacturing. Validation OS boots into a Command Line environment to increase reliability on the factory floor and supports running Win32 apps, smoothing the transition from early hardware bring-up to retail OS and apps development.

This is an intriguing Windows variant I'd never heard of before. Validation OS boots to a command line and sports a basic UI framework, and is supposedly capable to run Win32 applications, but if the early reports on forums are anything to go by, it's currently quite broken and effectively useless since Win32 applications do not actually run. As such, I'm not entirely sure who or what this is for, or if this is a very early release that needs a lot more work.

In any event, it's free, so no harm done in giving it a go.