diff --git a/src/java/com/threerings/media/tile/bundle/BundleUtil.java b/src/java/com/threerings/media/tile/bundle/BundleUtil.java
index 8a80f5eb9..00ebb0f73 100644
--- a/src/java/com/threerings/media/tile/bundle/BundleUtil.java
+++ b/src/java/com/threerings/media/tile/bundle/BundleUtil.java
@@ -1,9 +1,11 @@
 //
-// $Id: BundleUtil.java,v 1.3 2003/05/14 21:34:01 ray Exp $
+// $Id: BundleUtil.java,v 1.4 2003/07/28 04:07:30 mdb Exp $
 
 package com.threerings.media.tile.bundle;
 
 import java.io.BufferedInputStream;
+import java.io.File;
+import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.ObjectInputStream;
@@ -40,4 +42,23 @@ public class BundleUtil
             StreamUtil.close(tbin);
         }
     }
+
+    /**
+     * Extracts, but does not initialize, a serialized tileset bundle
+     * instance from the supplied file.
+     */
+    public static TileSetBundle extractBundle (File file)
+        throws IOException, ClassNotFoundException
+    {
+        // unserialize the tileset bundles array
+        FileInputStream fin = new FileInputStream(file);
+        try {
+            ObjectInputStream oin = new ObjectInputStream(
+                new BufferedInputStream(fin));
+            TileSetBundle tsb = (TileSetBundle)oin.readObject();
+            return tsb;
+        } finally {
+            StreamUtil.close(fin);
+        }
+    }
 }
diff --git a/src/java/com/threerings/media/tile/bundle/tools/DumpBundle.java b/src/java/com/threerings/media/tile/bundle/tools/DumpBundle.java
index 33056d498..82fcd915d 100644
--- a/src/java/com/threerings/media/tile/bundle/tools/DumpBundle.java
+++ b/src/java/com/threerings/media/tile/bundle/tools/DumpBundle.java
@@ -1,5 +1,5 @@
 //
-// $Id: DumpBundle.java,v 1.10 2003/05/13 21:33:58 ray Exp $
+// $Id: DumpBundle.java,v 1.11 2003/07/28 04:07:30 mdb Exp $
 
 package com.threerings.media.tile.bundle.tools;
 
@@ -24,7 +24,8 @@ public class DumpBundle
         boolean dumpTiles = false;
 
         if (args.length < 1) {
-            String usage = "Usage: DumpBundle bundle.jar [bundle.jar ...]";
+            String usage = "Usage: DumpBundle [-tiles] " +
+                "(bundle.jar|tsbundle.dat) [...]";
             System.err.println(usage);
             System.exit(-1);
         }
@@ -42,9 +43,14 @@ public class DumpBundle
 
             File file = new File(args[i]);
             try {
-                ResourceBundle bundle = new ResourceBundle(file);
-                TileSetBundle tsb = BundleUtil.extractBundle(bundle);
-                tsb.init(bundle);
+                TileSetBundle tsb = null;
+                if (args[i].endsWith(".jar")) {
+                    ResourceBundle bundle = new ResourceBundle(file);
+                    tsb = BundleUtil.extractBundle(bundle);
+                    tsb.init(bundle);
+                } else {
+                    tsb = BundleUtil.extractBundle(file);
+                }
 
                 Iterator tsids = tsb.enumerateTileSetIds();
                 while (tsids.hasNext()) {