Thank you Michael.
My home computer (seems) to have voluntarily switched to using (non-appdata) MoI3 files of type .ini and nodeeditor, for MoI4beta,
or else it has been that way for 9 months or so until I recently updated nodeeditor in appdata...

Changing one shortcut key in MoI 4 did not update the MoI3 .ini, (??)
I changed the Ctrl+Alt+N for Light Scheme nodeeditor in MoI3, and now the hot key works in MoI4.

Last night I updated nodeeditor in C:\Program Files (x86)\MoI 3.0, and now nodeeditor again works in MoI4beta.
I do not recall if MoI3 can use the appdata folder for customui and nodeeditor...

So I am still confused...
I'll puzzle on it some more.

I really like the appdata method.

- Brian
p.s. Everything seems to be working properly with the office computer.