The original WWW proposal is a Word for Macintosh 4.0 file from 1990. Recovering the text, diagrams, and formatting was not impossible but it was hard. A great example of the use of #emulation for historical research and digital preservation.
https://blog.jgc.org/2024/02/the-original-www-proposal-is-word-for.html
Edit: I'm glad this resonated with so many of you. Just to clarify— the author of the linked blog post is John Graham-Cumming (someone get him on fedi!) 💾
@kdriscoll
The proposal was written on a Mac, but the actual software was written on a NeXTSTEP machine? Odd combination.