Edit TITLE -> Cannot write

It seems to me that in an earlier version I could edit TITLE, but in 299a it won't allow this. Why?

I searched a bit more. I do not think it is MP3TAG that is causing the problem. The file is marked READ ONLY and due to a bug in Win 10 it can't be changed.
It would appear that the bug is also in Win 7.

There are a lot of wrong ideas about this circling around in the web.
Is the file marked read-only or is ist the folder?