title: How to open a word file with interop.word
body: <p>When I open a <code>.docx</code> file through <code>interop.word</code>, I can edit it by another editor tool.</p>
  
  <p>After editing it, the Interop.word find the file has been modified and will attempt to update the content edited.</p>
  
  <p>My code is below:</p>
  
  <pre><code>Word.Application app = new Microsoft.Office.Interop.Word.Application();
              Word.Document doc = null;
              object unknow = Type.Missing;
              app.Visible = true;
              string str = @"E:\1.doc";
              object file = str;
              doc = app.Documents.Open(ref file,
                  ref unknow, ref unknow, ref unknow, ref unknow,
                  ref unknow, ref unknow, ref unknow, ref unknow,
                  ref unknow, ref unknow, ref unknow, ref unknow,
                  ref unknow, ref unknow, ref unknow);
  </code></pre>
  
  <p>The error I get is telling me that the file is opened.</p>