A couple years later, NeXT released OpenStep for Windows NT 4 which included Windows NT/95-style artwork for the UI elements.

I'm sure it's long gone now but it used to be included with OS X (along with other NeXT-era artwork):

https://www.theregister.com/2008/09/02/mac_images/

Then about 10 years ago, MicroSoft (more likely somebody's 20% project) tried to do it again, this time based on iOS.

https://github.com/microsoft/WinObjC

> I’m sure [OpenStep for Windows NT is] long gone now

https://archive.org/details/open-step-entcd

Sorry, I meant Mac OS X used to include Windows 95/NT UI artwork (buttons, scrollers, etc) but I think it was purged 10 or 15 years ago.

Can you elaborate on this? Literal Windows UI artwork or Windows-like?

I never knew about this and was a NEXTSTEP/OpenStep/Rhapsody/OS X user and spelunker. Tell me more!

So OpenStep for Windows NT ran under windows NT and it looked like Win32 GDI but it wasn't Win32 GDI. It was still display postscript but the GUI elements (NSButtons, etc) were themed to look like Windows NT instead of NextStep. For whatever reason they were included in Mac OS AppKit as well.

Take a look at https://hetima.github.io/fucking_nsimage_syntax/2.html - specifically NSWin* images (sliders, checkboxes, arrows). You can also see some NextStep era artwork and MacOS 9 (Rhapsody) artwork.

Trivia: I know of one very large shipping company that still uses OpenStep on NT 4 for a specific system. It is at least mostly airgapped, at least.