Font problem creating WORD document with Oracle Reports 8i/9i

Question

I created a report using different Arial fonts. Once the report is generated from a .NET application, the fonts in the word document are changed apparently into Helvetica. This disarrange my lay-out completely. How can I solve this problem?
(NB. when I generate a PDF, there is no problem!)

Answer 1

By the way. I create the files in this way:
   private void createFile(String outFileName) {
      try {
         ByteArrayInputStream result = clientDoc.getPrintOutputController().export(ReportExportFormat.PDF);
         File newFile = new File(outFileName);
         FileOutputStream output = new FileOutputStream(newFile);
         int bytesRead = 0;
         byte[] byteArray = new byte[10000];
         while ((bytesRead = result.read(byteArray)) != -1) {
            output.write(byteArray, 0, bytesRead);
         output.flush();
         output.close();
      } catch (Exception e) {
         e.printStackTrace();