“You are not allowed to edit this selection because it is protected.” but only since Office 2013?

Question

We\'ve had these few lines of code running happily in our applications for several years (and in several versions of Office, 2003, 2007, 2010 etc). Purpose is to perform a kind

Answer 1

When you open a document, specify that it should not be opened as read-only

object readOnly = false; 
doc = word.Documents.Open(ref path, ref miss, ref readOnly, ...);