From my experience, you are "halfway there." After opening the file as read-only, save the file under a slightly different name (I use "-a" or "-1" at the end of the original filename). THEN the file will NOT be read-only, so make the edits and save. NOW, to avoid the link problem, with the file open simply click File | save as, and remove the extra characters in the name. When you NOW click save, it will ask you if you want to replace the existing (locked) file. Your answer should be "Yes," and you hopefully have come full circle. Others may have different ways to work around this locking issue, but this usually works.