HTML To Word Document using OpenXMl

http://www.microsoft.com/en-us/download/details.aspx?displaylang=en&id=5124

Download OpenXMLSDKTool.msi  and run it, you will  get DocumentFormat.OpenXml.dll 

http://html2openxml.codeplex.com/releases/view/64828

From this link you will get HTMLtoOpenXML.dll

Add these two reference.

using System.IO;

using DocumentFormat.OpenXml;

using DocumentFormat.OpenXml.Packaging;

using DocumentFormat.OpenXml.Wordprocessing;

using NotesFor.HtmlToOpenXml;

...

static void Main(string[] args)

{

     const string filename = "D:\test.docx";

     string html = "<font size='10' face='arial'>Hi this is html to word convert</font>" ;

     if (File.Exists(filename)) File.Delete(filename);

     using (MemoryStream generatedDocument = new MemoryStream())

     {

          using (WordprocessingDocument package = WordprocessingDocument.Create(generatedDocument, WordprocessingDocumentType.Document))

          {

               MainDocumentPart mainPart = package.MainDocumentPart;

               if (mainPart == null)

               {

                    mainPart = package.AddMainDocumentPart();

                    new Document(new Body()).Save(mainPart);

               }

               HtmlConverter converter = new HtmlConverter(mainPart);

               Body body = mainPart.Document.Body;

               var paragraphs = converter.Parse(html);

               for (int i = 0; i < paragraphs.Count; i++)

               {

                    body.Append(paragraphs[i]);

               }

               mainPart.Document.Save();

          }

          File.WriteAllBytes(filename, generatedDocument.ToArray());

     }

     System.Diagnostics.Process.Start(filename);

}