Well, ReactOS is a reimplementation of most of Windows, including the shell and the kernel.
Anecdotally, I once installed Ubuntu + Wine for someone non-technical who broke several Windows installations by infecting them with ransomware. He used it for like half a year calling it "this strange Windows" because some people don't know what an operating system is. He eventually irreparably broke its file system because apparently he was shutting down his machine by pulling the plug while it was running.
Anecdotally, I once installed Ubuntu + Wine for someone non-technical who broke several Windows installations by infecting them with ransomware. He used it for like half a year calling it "this strange Windows" because some people don't know what an operating system is. He eventually irreparably broke its file system because apparently he was shutting down his machine by pulling the plug while it was running.