Update 5.md

docs/lang/dev-en-HK/5.md

@@ -300,7 +300,7 @@ function addFileFromSelector(fileData){
 }
 ```
 
-![](img/devdoc/5/4png)
+![](img/devdoc/5/4.png)
 
 ## File Explorer Shortcuts
 The file explorer shortcuts is a set of ```.shortcut``` files located under user profile directory. The .shortcut files contains the following information, each data is seperated by a newline. (\n or \r\n depends on your host device operating system).