I guess NFNT already is a conversion of an original FONT, but my memory is getting vague. I think I know there also were FOND resources at one time, but Google doesn't help much there (to complicate matters, https://developer.apple.com/fonts/TrueType-Reference-Manual/... talks about 'fond' and 'sfnt' resources. There clearly has been quite a bit of evolution in font formats over time)
I copied the FONT info from each one into the NFNT portion of the resource fork in a newer file, then imported that file into FontForge for conversion to OS X-readable .dfont.
Actually, this reminds me of https://medium.com/designing-medium/system-shock-6b1dc6d6596... - Windows' font subsystem is super backward-compatible too. Sometimes too backward compatible. :P
Also, nice close/resize/FS buttons! :D (Also visible in the picture in OP's followup)
With a little modification, you can run apps from Windows 1.01 and 2.03 on XP, probably Vista, and maybe even newer: http://toastytech.com/guis/misc.html
Also, I admittedly have no experience with OS X, but I was recently given an old G5 to play with that I hope to get up and running at some point. This theme file looks quite fun to play with - will it work on PowerPC?
Here's System 0.85 Chicago being used in emacs, for example. Looks great in acme as well.
http://i.imgur.com/EuO2bvF.png