Microsoft Validation OS

Windows Validation OS (or WinVOS) is a minimal Windows 11-based environment intended to be used by Windows device manufacturers as an aid during early design stages. It is similar to Windows Preinstallation Environment in that it runs from a RAM disk and boots into a Command Prompt, although it is considerably more stripped down, leaving the bare essentials needed to bring up the Windows GUI and console.

Bugs and quirks

 * Because of the absence of visual styles, this version uses the Windows Classic theme. The theme itself is buggy and the buttons are displayed in weird number and text on the Lucida Console font due to the absence of most fonts.
 * Pressing ⊞ Win will cause the system to be stuck in a black screen.