diff --git a/pom.xml b/pom.xml
index d1c55fc..f4fdbab 100644
--- a/pom.xml
+++ b/pom.xml
@@ -3,7 +3,7 @@
   <groupId>istlab.KisoJikkenNWP</groupId>
   <artifactId>KisoJikkenNWP</artifactId>
   <packaging>jar</packaging>
-  <version>0.66</version>
+  <version>0.67</version>
   <name>KisoJikkenNWP</name>
   <url>http://maven.apache.org</url>
 
diff --git a/src/main/java/istlab/KisoJikken/Launcher.java b/src/main/java/istlab/KisoJikken/Launcher.java
index f1149cc..91ffccc 100644
--- a/src/main/java/istlab/KisoJikken/Launcher.java
+++ b/src/main/java/istlab/KisoJikken/Launcher.java
@@ -41,7 +41,7 @@
 public class Launcher extends JFrame implements MouseInputListener, KeyListener {
 
     public static Launcher theapp;
-    public static String version = "0.66";
+    public static String version = "0.67";
     public static String downloadurl = "https://cit.istlab.info/KisoJikkenNWP/target/";
     public static Path execPath;
     // JPanel mainP;
@@ -78,6 +78,7 @@
         tree.setModel(model);
         tree.addMouseListener(this);
         tree.addKeyListener(this);
+        tree.setCellRenderer(new MyTreeCellRenderer());
 
         // The JTree can get big, so allow it to scroll.
         JScrollPane scrollpane = new JScrollPane(tree);
diff --git a/src/main/java/istlab/KisoJikken/MyTreeCellRenderer.java b/src/main/java/istlab/KisoJikken/MyTreeCellRenderer.java
new file mode 100644
index 0000000..20df495
--- /dev/null
+++ b/src/main/java/istlab/KisoJikken/MyTreeCellRenderer.java
@@ -0,0 +1,28 @@
+package istlab.KisoJikken;
+
+import java.awt.Color;
+import java.awt.Component;
+
+import javax.swing.JTree;
+import javax.swing.tree.DefaultTreeCellRenderer;
+
+public class MyTreeCellRenderer extends DefaultTreeCellRenderer {
+
+    @Override
+    public Component getTreeCellRendererComponent(JTree tree, Object value,
+            boolean sel, boolean exp, boolean leaf, int row, boolean hasFocus) {
+        super.getTreeCellRendererComponent(tree, value, sel, exp, leaf, row, hasFocus);
+
+        // Assuming you have a tree of Strings
+        String node = (String) ((MyFile) value).toString();
+
+        // If the node is a leaf and ends with "xxx"
+        if (leaf && node.endsWith(".class")) {
+            // Paint the node in blue
+            setForeground(new Color(200, 200,230));
+            // setBackground(new Color(30, 30,50));
+        }
+
+        return this;
+    }
+}
\ No newline at end of file