Later note:
So I extracted wbwood.wba into a folder, found the file references in wbwood.uis (ca line 201), and changed that line to my editor:
<code>Command=texted.exe</code>
I then zipped up the folder, gave it a new name, renamed x.zip to x.wba, copied installed into WB, and loaded the theme...
but when I click on that button, it still runs notepad.exe ...
The only place that the name 'notepad' exists now, is in some backup files...
So I'm still missing something...