Windows - Cannot remove empty file

Encountered a weird one, today. Unfortunately, I did not get screen-shots.
When trying to delete a folder, I got a message that I could not because a sub-folder was open in another program.
Tried from command line, and it said that the folder was not empty.

Hmmm. That's odd ;-)

So I went folder by folder up the chain and found one that was marked as read-only.  I changed that setting, and was able to delete my folders.

Hope this help someone. Sorry for the lack of screen-shots.