title: Reconstructing docx from xml files
body: <p>From what I have read, docx files are zipped collections of xml file. On Windows 7, (the only OS on which I have tried this), if I save a file, say f.docx from Word, then exit Word and change the file name to f.zip, I can unzip the bundle and read the component files. But if I then remove then re-zip the f folder (without any modifications) and change the extension back to docx, I then get an error saying that "The file f.docx cannot be opened because there are problems with the contents". And when I look at the details, it says, "Microsoft Office cannot open this file because some parts are missing or invalid."</p>
  
  <p>Question: Why is that? And how <em>can</em> the component pieces be reassembled into a valid docx file?</p>
  
  <p>A similar question is asked <a href="https://superuser.com/questions/411911/re-zipped-docx-files-dont-open-in-word">here</a> but the offered solution does not work. As I've noted above, I'm not altering anything in the folders, nor even opening the files. Although I cannot see why it would be of relevance, my method for rezipping the file is to use the context-menu command "Send to compressed (zipped) folder".</p>