Does anyone know how to get the 25th anniversary version to run in a window instead of full screen? Thank you

I haven't tried this myself, but in the savegame folder you will see the T7G.ini--open it and under the [scummvm] heading look for fullscreen=true and change it to fullscreen=false, fire it up and see what happens!

I've tried several different methods.
ScummVM is being used to run The 7th Guest 25th Anniversary Edition.
Therefore you will need to use a ScummVM launch command line code to make ScumVM run windowed.
The code is -F for NOT fullscreen and -f for fullscreen.
Note that ScummVM is focused on running stretched-out-full-screen 16:9 aspect ratio display for 4:3 1990s games.
I'm not sure why - that really doesn't seem logical. It makes the game look weird and stretched out.
Recognize that ScummVM 4:3 windowed mode is flakey - at least if you are running on the latest production version of Windows 10 and using the latest nVidia driver like I do.
The stretched out 16:9 full screen mode is much more stable.