diff --git a/module/upgrade/config.php b/module/upgrade/config.php
index 0086b916b3..70f7bb6543 100644
--- a/module/upgrade/config.php
+++ b/module/upgrade/config.php
@@ -16,3 +16,5 @@ $config->upgrade->lowerTables[$config->db->prefix . 'userContact']    = $config-
 $config->upgrade->lowerTables[$config->db->prefix . 'userGroup']      = $config->db->prefix . 'usergroup';
 $config->upgrade->lowerTables[$config->db->prefix . 'userQuery']      = $config->db->prefix . 'userquery';
 $config->upgrade->lowerTables[$config->db->prefix . 'userTPL']        = $config->db->prefix . 'usertpl';
+
+$config->delete['10.6'][] = 'module/chat/ext/control/extensions.php';
diff --git a/module/upgrade/control.php b/module/upgrade/control.php
index 3c9ac880d6..f85ff42378 100644
--- a/module/upgrade/control.php
+++ b/module/upgrade/control.php
@@ -106,12 +106,24 @@ class upgrade extends control
     public function execute($fromVersion = '')
     {
         $this->session->set('step', '');
-        $fromVersion = isset($_POST['fromVersion']) ? $this->post->fromVersion : $fromVersion;
-        $this->upgrade->execute($fromVersion);
 
         $this->view->title      = $this->lang->upgrade->result;
         $this->view->position[] = $this->lang->upgrade->common;
 
+        $result = $this->upgrade->deleteFiles();
+        if($result)
+        {
+            $result[] = $this->lang->upgrade->afterDeleted; 
+
+            $this->view->result = 'fail';
+            $this->view->errors  = $result;
+
+            die($this->display());
+        }
+
+        $fromVersion = isset($_POST['fromVersion']) ? $this->post->fromVersion : $fromVersion;
+        $this->upgrade->execute($fromVersion);
+
         if(!$this->upgrade->isError()) $this->locate(inlink('afterExec', "fromVersion=$fromVersion"));
 
         $this->view->result = 'fail';
diff --git a/module/upgrade/lang/en.php b/module/upgrade/lang/en.php
index baced88afc..a8f61ee22a 100644
--- a/module/upgrade/lang/en.php
+++ b/module/upgrade/lang/en.php
@@ -46,5 +46,6 @@ $lang->upgrade->sureExecute   = 'Execute';
 $lang->upgrade->forbiddenExt  = 'Extension is not compatible with the version. It has been deactivated:';
 $lang->upgrade->updateFile    = 'File information has to be updated.';
 $lang->upgrade->noticeSQL     = 'Check that your database is inconsistent with the standard and try to fix failure. Please perform the following SQL and refresh.';
+$lang->upgrade->afterDeleted  = 'File is not deleted. Please refresh after you delete it.';
 
 include dirname(__FILE__) . '/version.php';
diff --git a/module/upgrade/lang/zh-cn.php b/module/upgrade/lang/zh-cn.php
index 731b0e3187..d70be49449 100644
--- a/module/upgrade/lang/zh-cn.php
+++ b/module/upgrade/lang/zh-cn.php
@@ -46,5 +46,6 @@ $lang->upgrade->sureExecute   = '确认执行';
 $lang->upgrade->forbiddenExt  = '以下插件与新版本不兼容，已经自动禁用：';
 $lang->upgrade->updateFile    = '需要更新附件信息。';
 $lang->upgrade->noticeSQL     = '检查到你的数据库跟标准不一致，尝试修复失败。请执行以下SQL语句，再刷新页面检查。';
+$lang->upgrade->afterDeleted  = '以上文件未能删除， 删除后刷新！';
 
 include dirname(__FILE__) . '/version.php';
diff --git a/module/upgrade/model.php b/module/upgrade/model.php
index 80b7638b34..17163a0240 100644
--- a/module/upgrade/model.php
+++ b/module/upgrade/model.php
@@ -472,6 +472,28 @@ class upgradeModel extends model
         return $alterSQL;
     }
 
+    /**
+     * Delete Useless Files 
+     * 
+     * @access public
+     * @return array
+     */
+    public function deleteFiles()
+    {
+        $result = array();
+        foreach($this->config->delete as $deleteFiles)
+        {
+            $basePath = $this->app->getBasePath();
+            foreach($deleteFiles as $file)
+            {
+                $fullPath = $basePath . str_replace('/', DIRECTORY_SEPARATOR, $file);
+                if(file_exists($fullPath) and !unlink($fullPath)) $result[] = $fullPath;
+            }
+        }
+        return $result;
+    }
+
+
 
     /**
      * Update ubb code in bug table and user Templates table to html.