Windows 97: Simulator
For purists, BetaArchive offers a WebAssembly port of a real Windows 97 beta build (version 4.10.1088). This is not a simulation; it is a full emulation. It runs slowly, crashes often, and is utterly glorious. You can actually write a WordPad document and "save" it to a virtual floppy disk.
While many developers have created their own versions, a few projects stand out for their detail and interactivity: windows 97 simulator