ar11导出word文档，docx格式错乱

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导出代码如下：

public void ProcessRequest(HttpContext context)
      {
         String filePath = context.Request.FilePath;
         filePath = filePath.Remove(filePath.Length - 4);
         String reportPath = context.Server.MapPath(filePath);
         String str =context.Request.QueryString["param"];
         PageReport rpt = new PageReport(new FileInfo(reportPath));
         String mimeType = "application/vnd.openxmlformats-officedocument.wordprocessingml.document";
         String filename = "test.docx";

         context.Response.ContentType = mimeType;
         context.Response.Clear();
         context.Response.AddHeader("content-disposition", "attachment;filename=" + filename);
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            GrapeCity.ActiveReports.Export.Word.Page.Settings wordSetting = new GrapeCity.ActiveReports.Export.Word.Page.Settings();
            wordSetting.UseMhtOutput = true;
         //docx
         wordSetting.FileFormat = GrapeCity.ActiveReports.Export.Word.Page.FileFormat.OOXML;
         //doc
         //wordSetting.FileFormat = GrapeCity.ActiveReports.Export.Word.Page.FileFormat.HTML;
            GrapeCity.ActiveReports.Export.Word.Page.WordRenderingExtension wordRenderingExtension =
            new GrapeCity.ActiveReports.Export.Word.Page.WordRenderingExtension();
            GrapeCity.ActiveReports.Rendering.IO.MemoryStreamProvider outputProvider = new GrapeCity.ActiveReports.Rendering.IO.MemoryStreamProvider();
            rpt.Report.ReportParameters[0].DefaultValue.Values.Add("EUNBDD180300029");
            rpt.Document.Render(wordRenderingExtension, outputProvider, wordSetting);

            outputProvider.GetPrimaryStream().OpenStream().CopyTo(ms);
            context.Response.BinaryWrite(ms.ToArray());
            context.Response.End();
      }

wordSetting.FileFormat = GrapeCity.ActiveReports.Export.Word.Page.FileFormat.OOXML; 这句是导出docx格式的，导出后office2007无法打开，office2010打开格式错乱。
wordSetting.FileFormat = GrapeCity.ActiveReports.Export.Word.Page.FileFormat.HTML;    设置成doc格式后打开是正常的。

附件是doc和docx的文件。