title: "The document is really a OOXML file" while opening doc files
body: <p>I get the following errors when I try to read the content of the doc file using apache poi 3.17:</p>
  
  <pre>
  java.lang.IllegalArgumentException: The document is really a OOXML file
      at org.apache.poi.hwpf.HWPFDocumentCore.verifyAndBuildPOIFS(HWPFDocumentCore.java:123)
      at org.apache.poi.hwpf.HWPFDocument.(HWPFDocument.java:169)
      at project12.Home12.button1ActionPerformed(Home12.java:312)
      at project12.Home12.access$300(Home12.java:24)
      at project12.Home12$3.actionPerformed(Home12.java:113)
      at java.awt.Button.processActionEvent(Button.java:409)
      at java.awt.Button.processEvent(Button.java:377)
      at java.awt.Component.dispatchEventImpl(Component.java:4889)
      at java.awt.Component.dispatchEvent(Component.java:4711)
      at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
      at java.awt.EventQueue.access$500(EventQueue.java:97)
      at java.awt.EventQueue$3.run(EventQueue.java:709)
      at java.awt.EventQueue$3.run(EventQueue.java:703)
      at java.security.AccessController.doPrivileged(Native Method)
      at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
      at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90)
      at java.awt.EventQueue$4.run(EventQueue.java:731)
      at java.awt.EventQueue$4.run(EventQueue.java:729)
      at java.security.AccessController.doPrivileged(Native Method)
      at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
      at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
      at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
      at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
      at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
      at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
      at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
      at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
  </pre>
  
  <p>I have included <code>xmlbeans-2.6.0.jar</code> and <code>dom4j-1.6.1.jar</code> but the problem persists.</p>