And it was all saved in the document. Also very easy to find the text. It had one excellent feature which I miss, You could have a page self-encrypt using AES-256. Great for holding passwords etc.
I used WOAS to deign software and had at least one very detailed design with several hundred pages each with links to other pages. Sadly WOAS was eventually killed by the browsers themselves, preventing files writing to disk. It’s not the only example of a single-file Wiki but they all suffered the same problem. I think someone came up with a Java shim that did the file writing but it was never the same.
Now I use WikidPad, it’s written in Python and I think just runbs on Windows, (though you wouldn’t know it) which works like WOAS but internally it uses SQLite to hold the Wiki pages. You can even use their website WikidPad but you have to register first. That picture is a screenshot of WikidPad.