Main.cs

using System;
using System.IO;
using System.Collections.Specialized;
using System.Text.RegularExpressions;

namespace WordCleaner
{
	class MainClass
	{
		static void Main(string[] args)
		{
		    if (args.Length == 0 || String.IsNullOrEmpty(args[0])) 
		    {
		        Console.WriteLine("No filename provided.");
		        return;
		    }
		
		    string filepath = args[0];
		    if (Path.GetFileName(filepath) == args[0])
		    {
		        filepath = Path.Combine(Environment.CurrentDirectory, filepath);
		    }
		    if (!File.Exists(args[0]))
		    {
		        Console.WriteLine("File doesn't exist.");
		    }
		
		    string html = File.ReadAllText(filepath);
		    Console.WriteLine("input html is " + html.Length + " chars");
		    html = CleanWordHtml(html);
		    html = FixEntities(html);            
		    filepath = Path.GetFileNameWithoutExtension(filepath) + ".modified.htm";            
		    File.WriteAllText(filepath, html);
		    Console.WriteLine("cleaned html is " + html.Length + " chars");
		}
		
		static string CleanWordHtml(string html)
		{
		    StringCollection sc = new StringCollection();
		    // get rid of unnecessary tag spans (comments and title)
		    sc.Add(@"<!--(\w|\W)+?-->");
		    sc.Add(@"<title>(\w|\W)+?</title>");
		    // Get rid of classes and styles
		    sc.Add(@"\s?class=\w+");
		    sc.Add(@"\s+style='[^']+'");
		    // Get rid of unnecessary tags
		    sc.Add(
		    @"<(meta|link|/?o:|/?style|/?div|/?st\d|/?head|/?html|body|/?body|/?span|!\[)[^>]*?>");
		    // Get rid of empty paragraph tags
		    sc.Add(@"(<[^>]+>)+&nbsp;(</\w+>)+");
		    // remove bizarre v: element attached to <img> tag
		    sc.Add(@"\s+v:\w+=""[^""]+""");
		    // remove extra lines
		    sc.Add(@"(\n\r){2,}");
		    foreach (string s in sc)
		    {
		        html = Regex.Replace(html, s, "", RegexOptions.IgnoreCase);
		    }
		    return html;
		}
		
		static string FixEntities(string html)
		{
		    NameValueCollection nvc = new NameValueCollection();
		    nvc.Add("\"", "&ldquo;");
		    nvc.Add("\"", "&rdquo;");
		    nvc.Add("–", "&mdash;");
		    foreach (string key in nvc.Keys)
		    {
		        html = html.Replace(key, nvc[key]);
		    }
		    return html;
		}
	}
}