It's rather long, but iirc the gist was that the installer wouldn't work on 95, so he figured out what the installer did (files, registry) and created a new one. Then a few WinAPI functions were missing and he created stub dlls that would provide them and pass through everything else. And probably some other minor roadblocks.
https://www.youtube.com/watch?v=CTUMNtKQLl8
It's rather long, but iirc the gist was that the installer wouldn't work on 95, so he figured out what the installer did (files, registry) and created a new one. Then a few WinAPI functions were missing and he created stub dlls that would provide them and pass through everything else. And probably some other minor roadblocks.