Please note this is an old forum thread. Information in this post may be out-to-date and/or erroneous.
Every phpdocx version includes new features and improvements. Previously unsupported features may have been added to newer releases, or past issues may have been corrected.
Seems you're opening DOCX files using a temp directory, so the file is in read mode; this is the same as when you open DOC, TXT, RTF...; just first save the document on disk an then open it.