diff --git a/module/editor/control.php b/module/editor/control.php
index 44c0c2aca6..ea31e343df 100644
--- a/module/editor/control.php
+++ b/module/editor/control.php
@@ -17,11 +17,59 @@ class editor extends control
      * @access public
      * @return void
      */
-    public function index()
+    public function index($editFileName = '', $action = '')
     {
         $allModules = $this->editor->getModuleFiles();
-        $this->view->tree = $this->editor->printTree($allModules);
+        $this->view->tree     = $this->editor->printTree($allModules);
+        $editFileName = helper::safe64Decode($editFileName);
+        $fileContent  = '';
+        if($editFileName and file_exists($editFileName))
+        {
+            if($action == 'edit')
+            {
+                $fileContent = file_get_contents($editFileName);
+            }
+        }
+        $this->view->fileContent = $fileContent;
+        $this->view->filePath    = empty($fileContent) ? '' : $editFileName;
         $this->display();
     }
+
+    /**
+     * Save file to extension.
+     * 
+     * @param  string $filePath 
+     * @access public
+     * @return void
+     */
+    public function save($filePath = '')
+    {
+        if($filePath and $_POST)
+        {
+            $filePath = helper::safe64Decode($filePath);
+            $this->editor->save($filePath);
+            die(js::reload('parent'));
+        }
+    }
+
+    /**
+     * Delete extension file.
+     * 
+     * @param  string $filePath 
+     * @param  string $confirm 
+     * @access public
+     * @return void
+     */
+    public function delete($filePath = '', $confirm = 'no')
+    {
+        if($confirm == 'no')
+        {
+            die(js::confirm($this->lang->editor->deleteConfirm, inlink('delete', "filePath=$filePath&confirm=yes")));
+        }
+        $filePath = helper::safe64Decode($filePath);
+        if(file_exists($filePath) and unlink($filePath)) die(js::reload('parent'));
+        die(js::alert($this->lang->editor->noDelete));
+
+    }
 }
 
diff --git a/module/editor/model.php b/module/editor/model.php
index af4d0452a9..2b6ebcf03b 100644
--- a/module/editor/model.php
+++ b/module/editor/model.php
@@ -34,21 +34,77 @@ class editorModel extends model
                 $moduleFullFile = $moduleFullDir . '/' . $moduleFile;
                 if($moduleFile == 'control.php' or $moduleFile == 'model.php')
                 {
-                    $allModules[$moduleDir][$moduleFullFile] = $this->analysis($moduleFullFile);
+                    $allModules[$moduleFullDir][$moduleFullFile] = $this->analysis($moduleFullFile);
+                }
+                elseif($moduleFile == 'ext')
+                {
+                    $allModules[$moduleFullDir][$moduleFullFile] = $this->getExtensionFiles($moduleFullFile);
                 }
                 elseif(is_dir($moduleFullFile)) 
                 {
-                    foreach(glob($moduleFullFile . '/' . '*.php') as $fileName) $allModules[$moduleDir][$moduleFile][$fileName] = basename($fileName);
+                    foreach(glob($moduleFullFile . '/' . '*.php') as $fileName) $allModules[$moduleFullDir][$moduleFullFile][$fileName] = basename($fileName);
                 }
                 else
                 {
-                    $allModules[$moduleDir][$moduleFullFile] = $moduleFile;
+                    $allModules[$moduleFullDir][$moduleFullFile] = $moduleFile;
                 }
             }
         }
         return $allModules;
     }
 
+    /**
+     * Get extension files.  
+     * 
+     * @param  int    $extPath 
+     * @access public
+     * @return void
+     */
+    public function getExtensionFiles($extPath)
+    {
+        $extensionList = array();
+        $extensionDirs = scandir($extPath);
+        foreach($extensionDirs as $extensionDir)
+        {
+            if($extensionDir == '.' or $extensionDir == '..' or $extensionDir == '.svn') continue;
+            $extensionFullDir = $extPath . '/' . $extensionDir;
+            if(is_dir($extensionFullDir))
+            {
+                $extensionList[$extensionFullDir] = array();
+                /* extend of lang is more a grade of directroy. */
+                if($extensionDir == 'lang')
+                {
+                    $langDirs = scandir($extensionFullDir);
+                    foreach($langDirs as $langDir)
+                    {
+                        if($langDir == '.' or $langDir == '..' or $langDir == '.svn') continue;
+                        $langFullDir = $extensionFullDir . '/' . $langDir;
+                        $extensionList[$extensionFullDir][$langFullDir] = array();
+                        if(is_dir($langFullDir))
+                        {
+                            $langFiles = scandir($langFullDir);
+                            foreach($langFiles as $langFile)
+                            {
+                                if($langFile == '.' or $langFile == '..' or $langFile == '.svn') continue;
+                                $langFullFile = $langFullDir . '/' . $langFile;
+                                $extensionList[$extensionFullDir][$langFullDir][$langFullFile] = $langFile;
+                            }
+                        }
+                    }
+                    continue;
+                }
+                $extensionFiles = scandir($extensionFullDir);
+                foreach($extensionFiles as $extensionFile)
+                {
+                    if($extensionFile == '.' or $extensionFile == '..' or $extensionFile == '.svn') continue;
+                    $extensionFullFile = $extensionFullDir . '/' . $extensionFile;
+                    $extensionList[$extensionFullDir][$extensionFullFile] = $extensionFile;
+                }
+            }
+        }
+        return $extensionList;
+    }
+
     /**
      * Analysis methods of control and model.
      * 
@@ -95,11 +151,39 @@ class editorModel extends model
             }
             else
             {
-                $tree .= $file . "\n";
+                if(strpos($key, '/ext/') !== false)
+                {
+                    $tree .= $file . html::a(inlink('index', "editFileName=" . helper::safe64Encode($key) . "&action=edit"), $this->lang->edit) . html::a(inlink('delete', 'path=' . helper::safe64Encode($key)), $this->lang->delete, 'hiddenwin') . "\n";
+                }
+                else
+                {
+                    $tree .= $file . "\n";
+                }
             }
             $tree .= "</li>\n";
         }
         $tree .= "</ul>\n";
         return $tree;
     }
+
+    /**
+     * Save file to extension.
+     * 
+     * @param  string    $filePath 
+     * @access public
+     * @return void
+     */
+    public function save($filePath)
+    {
+        $fileContent = $this->post->fileContent;
+        if(get_magic_quotes_gpc()) $fileContent = stripslashes($fileContent);
+        if(is_writable($filePath))
+        {
+            file_put_contents($filePath, $fileContent);
+        }
+        else
+        {
+            die(js::alert($this->lang->editor->noWritable));
+        }
+    }
 }
diff --git a/module/editor/view/index.html.php b/module/editor/view/index.html.php
index abbe68d358..cc9c268bf6 100644
--- a/module/editor/view/index.html.php
+++ b/module/editor/view/index.html.php
@@ -13,13 +13,20 @@
 <?php include '../../common/view/header.html.php';?>
 <?php include '../../common/view/treeview.html.php';?>
 <table class='table-1'>
-<tr><td>
-<?php echo $tree;?>
-<br />
-</td>
-<td>
-</td>
-</tr>
+  <tr>
+    <td width='300'>
+    <?php echo $tree?>
+    <br />
+    </td>
+    <td valign='top'>
+    <span><?php if($filePath) printf($lang->editor->editFile,$filePath)?></span>
+    <form method='post' target='hiddenwin' action='<?php echo inlink('save', "filePath=" . helper::safe64Encode($filePath))?>'>
+    <?php echo html::textarea('fileContent', $fileContent, "class='area-1' rows=40")?>
+    <br/>
+    <?php echo html::submitButton()?>
+    </form>
+    </td>
+  </tr>
 </table>
 <?php include '../../common/view/footer.html.php';?>