Packaging a PostScript Printer Description (PPD) file as a signed Windows 10 x64 printer driver

Why?

After getting my Polaroid CI-5000 film recorder working as a printer on Windows 98SE, I wanted to share it to my main Windows 10 PC.

I expected this would just work, like my considerably more modern (but still ancient) HP Laserjet.
BOY was I wrong!

Turns out, you need a working driver for BOTH systems, and the newest I had was for Windows NT4.

So, here's a guide on how I turned my film recorder's