Thanks, guys.
That VLC looks promising, so I'll try it.
It seems that W10 is changing even from the page that Joe suggests, as I have a couple of programs that that page says W10 hasn't.
Not an Email program, though. Have to get one of those, too.

My Nero is version 5, and was bundled with something that died long ago!
Stand-alone scanner? Before printers had scanners?

Perhaps I should take this old faithful off the web so it works forever.
And take my surplus DVD player to the electronics whizz to get it unlocked. I was saving it to play CDs when the one in the stereo died, but.....
We get quite a few out-of-zone DVDs here in zone4, mostly English/zone2