Theoretically you can still get WPF running on another OS, but you'd have to do it the same way that WSL gets an Ubuntu userland running on Linux: You introduce a compatibility layer that it runs on top of.

I think I'd prefer that approach, anyway - I'd guess it's cleaner and ultimately more maintainable than introducing a whole bunch of conditional logic for handling all the cross-platform issues into an already complicated piece of software.

WPF already has such a layer, actually - Media Integration Layer, MIL.

No, it never had a goal of being portable to non-Microsoft platforms, and it doesn't suddenly add that as a goal just because it's open source now.

Well for WPF there was silverlight for a while, a limited but (gimped)cross platform version of WPF.

I wouldn't be surprised if there were abstractions to make porting to openGL easier.

> it's a framework with explicit goals of being cross-platform

where did they notate their goals for wpf and winforms to be cross-platform? they specifically mentioned they open-sourced them to open up windows development.

You're right. I mistakenly conflated the goals of wpf with dotnetcore.