OK. So my text file "AutoExec.bat" file could be renamed "Auto20221107.bat" with impunity. It is just another program in this case a DOS Batch file - that gets executed after Windows has done what used to be Autoexec.bat.
Excepting, still, that what used to be "Autoexec.bat" in Win 3.1, and even in DOS, was always "just another program to be executed after the machine has started.
In DOS we had only a file Autoexec.bat, but now in "C:\Users\Chris075\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup" we can load into that folder as many programs, even as many different types of program, as we see fit.
Back in the days of DOS we had to build calls to different programs into our AutoExec,bar file, and that file had to be called AutoExec.bat, and it had to be in the root folder of drive C:.
Have I finally got it right after some 39 years?
Thanks in anticipation
Chris