Windows 25

Windows 25 is Scratch OS. It's created by Lampik499 aka @BaldiBasicsStuff99 on Scratch. Lampik499 even created a Scratch account, that focused on Windows 25 project. Link to it: https://scratch.mit.edu/users/HisstechWindows25/

Links

Archive

Windows 25 original project

Plus/Activated version of Windows 25's Second Version

"Hisstech Ltd" - unreal company, that created Windows 25. It's Lampik499's netart too :)
Windows93. Heavily inspired of this.