If a file is linked, there is another option that applies -- Tools | Options | Documents | Allow internal editing of linked documents.
Also, if you view a stored file and it's not configured to be made writeable, and then you later add that file's extension for writeable editing, you may need to restart UR to get a writreable copy of the file (and it's possible that unstoring/storing will have the same effect), but I can't explain how toggling a linked file to stored, then linked would make it editable. Oh well, at least it's working.
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