1. Start Outlook or Outlook Express, and then open the message that contains the .xml file attachment that you want to open. 2. Right-click the attachment, and then click Save As. 3. In the Save Attachment dialog box, specify a name and a location in which to save the file, and then click Save. 4. Close the message window. 5. Start Windows Explorer, and then locate the .xml file that you saved in step 3. 6. Double-click the file to open it.