how should I use jnlp.versionEnabled property?

[pedram]

I have 2 jar files (MyArchive.jar and MyArchive__V2.5.jar) and I want to use the second one. but the first one is used in my applet.
This is my jnlp file:

<?xml version="1.0" encoding="UTF-8"?>
<jnlp 
codebase="file:///home/pedram/Desktop/applet/"
href="MyApplet.jnlp">
     <information>
       <title>test applet</title>
       <vendor>vendor</vendor>
     </information>     
     <resources>
      <j2se version="1.6+" href="http://java.sun.com/products/autodl/j2se"/>
       <jar href="MyArchive.jar" version="2.5"/>
       <property name="jnlp.versionEnabled" value="true"/>
     </resources>
     <applet-desc
         name="my applet"
         main-class="mypack.MyApplet"
         width="800"
         height="600">
     </applet-desc>
 </jnlp>