[WorldMaker]

MSIX packages have a lot of very interesting technical support for "overlays" that could be used for some very powerful mod/patch support if there was a good UI for it and maybe sideloading support with a good UI for it.

You couldn't just open File Explorer and expect to fiddle bits directly in Notepad.exe, but MSIX had the capabilities to create a "Package Explorer" to fiddle some bits in Notepad.exe (or whatever) and then package the fiddling into an overlay.

A couple games have used a subset of this tech to provide official mod support, but yeah it's overall a shame that Microsoft teased the idea of but never quite developed a general option/solution for "MSIX mods" at a high level despite having most of the platform tech for it.