Reminds me of when I first started learning computers, there was a version of Windows 3.11 that fit on a single 1.4M floppy. Some of them fit even more stuff by uncompressing the floppy into a ramdisk.
You could even make your own, starting with the file manager from Windows 3.1 and some files from a Windows 95 CD (the installer for 95 ran a stripped down 3.1)