--- src/java/org/apache/poi/poifs/filesystem/POIFSFileSystem.java	(revision 387392)
+++ src/java/org/apache/poi/poifs/filesystem/POIFSFileSystem.java	(working copy)
@@ -104,6 +104,9 @@ 
                 .getRoot(), header_block_reader
                     .getSBATStart()), data_blocks, properties.getRoot()
                         .getChildren(), null);
+
+        // DPN: Workaround the class ID clobbering, because I can't find where it's being clobbered.
+        getRoot().setStorageClsid(properties.getRoot().getStorageClsid());
     }
 
     /**