diff --git a/src/main/java/cit/PureATN/KeyEvent_on_Note.java b/src/main/java/cit/PureATN/KeyEvent_on_Note.java
index 0c94b37..4d00e55 100644
--- a/src/main/java/cit/PureATN/KeyEvent_on_Note.java
+++ b/src/main/java/cit/PureATN/KeyEvent_on_Note.java
@@ -1,6 +1,8 @@
 package cit.PureATN;
 
 import java.awt.event.KeyListener;
+import java.text.SimpleDateFormat;
+import java.util.Date;
 
 import org.piccolo2d.PCanvas;
 import org.piccolo2d.activities.PTransformActivity;
@@ -42,6 +44,10 @@
         if (e.getKeyCode() == KeyEvent.VK_S) {
             byte[] ba = PenUser.byteSerializeExport();
             PenUser.saveToFile(null, ba);
+
+            SimpleDateFormat sdfdate = new SimpleDateFormat("yyyy-MM-dd_HH-mm-ss");
+            PenUser.saveToFile("output_"+sdfdate.format(new Date())+".patn", ba);
+        
         }
         if (e.getKeyCode() == KeyEvent.VK_Q) {
             System.exit(0);
diff --git a/src/main/java/cit/PureATN/Note.java b/src/main/java/cit/PureATN/Note.java
index a09c72a..9a907ad 100644
--- a/src/main/java/cit/PureATN/Note.java
+++ b/src/main/java/cit/PureATN/Note.java
@@ -1,17 +1,16 @@
 package cit.PureATN;
 
+import java.awt.dnd.DropTarget;
+import java.awt.dnd.DropTargetDropEvent;
+
 import java.awt.event.InputEvent;
-import java.awt.geom.Point2D;
+import java.util.TooManyListenersException;
 
 import javax.swing.WindowConstants;
 
-import org.piccolo2d.PCamera;
 import org.piccolo2d.PCanvas;
 import org.piccolo2d.PLayer;
-import org.piccolo2d.PNode;
 import org.piccolo2d.event.PBasicInputEventHandler;
-import org.piccolo2d.event.PDragSequenceEventHandler;
-import org.piccolo2d.event.PInputEvent;
 import org.piccolo2d.event.PInputEventFilter;
 import org.piccolo2d.event.PMouseWheelZoomEventHandler;
 import org.piccolo2d.extras.PFrame;
@@ -74,6 +73,15 @@
         getCanvas().setDefaultRenderQuality(PPaintContext.HIGH_QUALITY_RENDERING);
         getCanvas().setAnimatingRenderQuality(PPaintContext.HIGH_QUALITY_RENDERING);
         getCanvas().setInteractingRenderQuality(PPaintContext.HIGH_QUALITY_RENDERING);
+
+        //ドラッグ＆ドロップによるファイルオープン
+        DropTarget dropTarget = new DropTarget();
+        try{
+			dropTarget.addDropTargetListener(new PathDropTargetListener(this));
+			getCanvas().setDropTarget(dropTarget);
+		}catch(TooManyListenersException ex){
+			ex.printStackTrace(System.out);
+		}
     }
 
     public SquiggleEventHandler createSquiggleEvent(){ // may be overridden
@@ -87,7 +95,7 @@
      */
     public void setMousePenID(int penidint) {
         mousePenID = penidint;
-        setTitle(currentTitle + " [PenID:0" + penidint + "]");
+        setTitle(currentTitle + String.format(" [PenID:%02d]" , penidint ));
     }
 
     public int mousePenID = 1; // マウスで描くときのPenID
@@ -96,4 +104,9 @@
         return mousePenID;
     }
 
+    public void openFile(String absolutePath, DropTargetDropEvent dtde) {
+        byte[] ba = PenUser.loadFromFile(absolutePath);
+        PenUser.byteSerializeImport(ba);
+    }
+
 }
diff --git a/src/main/java/cit/PureATN/PathDropTargetListener.java b/src/main/java/cit/PureATN/PathDropTargetListener.java
new file mode 100644
index 0000000..ce6f031
--- /dev/null
+++ b/src/main/java/cit/PureATN/PathDropTargetListener.java
@@ -0,0 +1,53 @@
+package cit.PureATN;
+
+import java.awt.datatransfer.DataFlavor;
+import java.awt.datatransfer.UnsupportedFlavorException;
+import java.awt.dnd.DnDConstants;
+import java.awt.dnd.DropTargetDragEvent;
+import java.awt.dnd.DropTargetDropEvent;
+import java.awt.dnd.DropTargetEvent;
+import java.awt.dnd.DropTargetListener;
+import java.io.File;
+import java.io.IOException;
+import java.util.List;
+
+public class PathDropTargetListener implements DropTargetListener{
+	Note parent;
+	PathDropTargetListener(Note parentd){
+		parent = parentd;
+	}
+	@SuppressWarnings("unchecked")
+	public void drop(DropTargetDropEvent dtde) {
+{
+			DataFlavor[] dataFlavours = dtde.getCurrentDataFlavors();
+			for(int i=0; i<dataFlavours.length; i++) {
+				if(dataFlavours[i].isFlavorJavaFileListType()) {
+					try {
+						dtde.acceptDrop(DnDConstants.ACTION_COPY);
+						List<File> fileList = (List<File>) dtde.getTransferable().getTransferData(dataFlavours[i]);
+						
+						for(File file: fileList) parent.openFile(file.getAbsolutePath(), dtde);
+						//Iterate the file list...
+					} catch (UnsupportedFlavorException e1) {
+						// handle the exception
+					} catch (IOException e1) {
+					// handle the exception
+					}
+				}
+			}
+		}
+	}
+	public void dragEnter(DropTargetDragEvent dtde) {
+		dtde.acceptDrag(DnDConstants.ACTION_MOVE);
+		//    System.out.println("enter");
+	}
+	public void dragOver(DropTargetDragEvent dtde) {
+		//    System.out.println("over");
+	}
+	public void dropActionChanged(DropTargetDragEvent dtde) {
+		//    System.out.println("action changed");
+	}
+	public void dragExit(DropTargetEvent dte) {
+		//    System.out.println("exit");
+	}
+}
diff --git a/src/main/java/cit/PureATN/SquiggleEventHandler.java b/src/main/java/cit/PureATN/SquiggleEventHandler.java
index f209e60..260b71b 100644
--- a/src/main/java/cit/PureATN/SquiggleEventHandler.java
+++ b/src/main/java/cit/PureATN/SquiggleEventHandler.java
@@ -18,8 +18,7 @@
     }
 
     public String getPenIDStr() {
-        String mousePenIDStr = "pen0" + note.getMousePenID();
-        return mousePenIDStr;
+        return String.format("pen%02d" ,note.getMousePenID());
     }
 
     public void startDrag(final PInputEvent e) {