Have you ever thought, “I wish Windows and Windows apps had the equivalant of a browser’s UserScripts and CSS Styles”. Now they do, in the form of the freeware Windhawk for Windows. Version 1.0 released at Christmas 2022, and it’s now in 1.31 (April 2023).
Dark mode for Notepad? It’s here. Replace any text with any other text, in any Windows program UI? That to. Force dark mode in the new Microsoft Paint? Yup. There are many more mods, including ones that add much-missed Windows 7 functionality to later lesser versions of Windows.
Yes, it injects code into a running Windows process (not into critical system processes). Your anti-virus and PC may freak out at that, especially in Windows 10/11. But source code is available for all mods, and there’s a central repository which checks the code before adding the mod.
Possibly especially useful if you have a fine bit of creative software which lacks the dark mode that artists like. Dark mode for Poser, anyone?