I have an rtf file (wordpad file) on c:\ and after I modify it I get access denied so I can't save it with the modification.  I tried another file on c:\ and had the same result.  Never had the problem before.

I copied the file to another folder/directory and could modify and save it there.  Why can't I modify it in the root directory when that's where I originally saved and modified it?

This is Windows 10.

The properties are not hidden, read only or system.