"Polyglot files are unnatural and never existed in the wild", they say.

Aperture cards are punched cards with a microfiche, indexing 'analogue' images with punched cards data on the same medium.
A standard polyglot document IRL defined in the 1960s.

The craziest file I made & visualized recently was combining the Doom PDF with a DOS & Windows (EXE & PE) polyglot.

Now you can run Doom on Microsoft operating systems from 1993 until today, and also under Chrome-based PDF viewers!

Naturally, it's hard to to cover everything for such a complex file in a single page - so I didn't make it an HTML polyglot that would run Doom as JavaScript: trivial, but no more room on that page! (3/3)