Does anyone recognize this format?

https://github.com/Helios-vmg/ONSlaught/tree/master/trunk/doc/NScrAPI

I'm 80% I used to open this with a browser, but none of them work nowadays, so maybe I'm wrong. Is there some software out there that can display XMLs with CSS sort like they were were HTMLs?
Works fine, as long as files are served via http server -- https://imgur.com/a/WZBoBlt
Huh. I'll have to try that later.
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