enter code here

Application wordApp = new Application
        {
            Visible = false
        };
DirectoryInfo directoryInfo = new DirectoryInfo("D:\WordPlugin\AutomationApp\AutomationApp\Content\Templates");

        string tempFile = "D:\WordPlugin\AutomationApp\AutomationApp\Content\Templates";
        FileInfo[] fileInfo = directoryInfo.GetFiles();
        object missing = Missing.Value;
        object readOnly = false;
        object isVisible = false;

        foreach (FileInfo info in fileInfo)
        {
            object filename = info.FullName;

            Document doc = wordApp.Documents.Open(ref filename, ref missing, ref readOnly, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing,
                                                  ref missing, ref isVisible, ref missing, ref missing, ref missing, ref missing);

            doc.Activate();

            //if (!info.Name.Contains(".docx"))
            string newFileName = string.Format("{0}\{1}", tempFile, info.Name.Replace(".doc", ".docx"));

            doc.SaveAs2(newFileName, WdSaveFormat.wdFormatXMLDocument,
                 CompatibilityMode: WdCompatibilityMode.wdWord2013);
            var documentAddIn = doc.Application.ActiveDocument;

        }

expecting the suggestion which can access the menu bar items( Home,
 Insert, Design and my VSTO menu item)