Personalization Change Theme in Windows 11

I wrote a command line script which changes the current theme.

Normally, when you open any theme file the CLSID handler will switch themes and automatically run Settings > Personalization > Themes.

Most tutorials have you task kill Settings, but usually there's a race condition. If your script tries to kill Settings too early, it misses the chance. When you script waits too long, Settings appears onscreen for a few seconds. The key is use PowerShell to wait in a loop.

Depending on your background's detail level, you might see Settings flash for a half-second. This is because Settings is trying to convert the theme's JPEG file to a transcoded version for faster loading. The more compressible the background, the more likely you see the effect.

You can try to adjust the timing. "-m 2" is two milliseconds delay. Shorter is not always smoother.
There is a two second pause at the end, to prevent you from switching again, before it has a chance to finish.

SetTheme C:\Windows\resources\Themes\dark.theme
SetTheme "C:\Users\GARLIN\AppData\Local\Microsoft\Windows\Themes\Pantone C\Pantone C.theme"


I haven't tried W10, but it should work.