Well, I just removed free AVG from my laptop and installed avast! Home 4.8.1229.
The entries are exactly as shown in all four of the (nicely merged into one) screen captures posted up by olddog. However, I can't say if they were there from the start or after an update as hlecter's observation would indicate. I wish I would have paid more attention to that.
Regardless of the feedback I got from avast! support, I don't believe the weird locations could possibly be correct and I went in and edited them out and entered C:\WINDOWS\CSD\?0?
??. I love the Huh smiley!
It would seem the weird locations didn't break anything and whether a location exists or not isn't an issue from the standpoint of security.
Finally, I'm probably the only one to have been subject to this singular anomaly - or the only one to notice it.
I wonder, tho, how it is avast! could tell me: "These entries are safe, they should be included there. Do not worry about it."
And finally finally:
Thanks for all the help, forum members!