using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Xml;
using System.Xml.Linq;
using DocumentFormat.OpenXml.Packaging;

public static class LocalExtensions
{
    public static XDocument GetXDocument(this OpenXmlPart part)
    {
        XDocument xdoc = part.Annotation<XDocument>();
        if (xdoc != null)
            return xdoc;
        using (StreamReader streamReader = new StreamReader(part.GetStream()))
            xdoc = XDocument.Load(XmlReader.Create(streamReader));
        part.AddAnnotation(xdoc);
        return xdoc;
    }

    public static void SaveXDocument(this OpenXmlPart part)
    {
        XDocument xdoc = part.Annotation<XDocument>();
        if (xdoc != null)
        {
            using (XmlWriter xw =
              XmlWriter.Create(part.GetStream(FileMode.Create, FileAccess.Write)))
                xdoc.WriteTo(xw);
        }
    }
}

class Program
{
    // get rid of every rsid attribute/element in the doc.
    // they exist to enable merging of forked documents; not something
    // we're interested in here.  if we don't delete these nodes, they
    // show up as changed.
    private static void CleanUp(XDocument doc)
    {
        XNamespace w =
            "http://schemas.openxmlformats.org/wordprocessingml/2006/main";
        doc.Descendants().Attributes(w + "rsidTr").Remove();
        doc.Descendants().Attributes(w + "rsidSect").Remove();
        doc.Descendants().Attributes(w + "rsidRDefault").Remove();
        doc.Descendants().Attributes(w + "rsidR").Remove();
        doc.Descendants().Attributes(w + "rsidDel").Remove();
        doc.Descendants().Attributes(w + "rsidP").Remove();
        doc.Descendants(w + "rsid").Remove();
    }

    static void Main(string[] args)
    {
        foreach (var file in args)
        {
            using (WordprocessingDocument doc =
                WordprocessingDocument.Open(file, true))
            {
                XDocument xDoc = doc.MainDocumentPart.GetXDocument();
                CleanUp(xDoc);
                doc.MainDocumentPart.SaveXDocument();

                foreach (var h in doc.MainDocumentPart.HeaderParts)
                {
                    xDoc = h.GetXDocument();
                    CleanUp(xDoc);
                    h.SaveXDocument();
                }

                foreach (var f in doc.MainDocumentPart.FooterParts)
                {
                    xDoc = f.GetXDocument();
                    CleanUp(xDoc);
                    f.SaveXDocument();
                }
            }
        }
    }
}