There used to be a hacked version of Windows 3.1 in the early '90s that fit on a 3.5" floppy (I think it was called Windows Lite), and it was extremely stripped down. The use case was that it could launch Write.exe (https://en.wikipedia.org/wiki/Microsoft_Write), which let you present formatted materials onscreen similar to Word, so it acted sort of like a light-weight alternative to PowerPoint. Anytime I had to present on someone else's machine, I would use it to ensure things would work.

(Write.exe is still present in Windows 10, and redirects to WordPad, which replaced Write.exe in Windows 95.)