I was there at Microsoft in the beginning of MSI, which was what, Office XP? Gosh or was it 2003? The tooling for dealing with them was super jank then. I could have never predicted that you'd be able to just casually open it in a browser. Nice job man!

I remember dealing with installing the Windows Installer redistributable on Windows 98. The Wikipedia[0] article cites Office 2000 shipped w/ Windows Installer 1.0.

[0] https://en.wikipedia.org/wiki/Windows_Installer