OK, forget it.
I found that I could add a properties column “File extension” in the windows explorer, and that does what I want.
“File type” will group file types which have been associated to a software, while “File extension” does cares about the file suffix.
I don’t delete the post in case it helps someone else.
Yeah, that’s what I’m doing mostly these days, along with hiking. However, I do have a class I have to give starting in less than two weeks, so I’m (begrudgingly) starting to prepare…
Not 100%, no… I was kinda ‘volunteered’ for this responsibility. I am working on passing it on to someone else in the near future so I can up my retirement percent a bit…