Tested build: jdk7 b127-pit
http://rehudson.sfbay.sun.com/hudsonws/deploypit/bundles/windows-i586/b255-2011-01-20_29/
Tested OS: Windows XP
Tested browser: IE8

On Windows XP, in jnlp file, when using <resources os="Windows XP DDD"> or <resources os="Windows DDD">, the application should not be launch. But the application launched. Notice, this can not reproduce on Windows Vista or Windows 7.

Steps to reproduce:
1) Find a Windows XP machine
2) Open the following applet:
http://sqeweb.sfbay.sun.com/net/sqenfs-1/export1/comp/jsn/users/jean/CR_Example/7014170/HelloWorld.html
http://sqeweb.sfbay.sun.com/net/sqenfs-1/export1/comp/jsn/users/jean/CR_Example/7014170/HelloWorld2.html
3) The application have been launched.

Source code:
http://sqeweb.sfbay.sun.com/net/sqenfs-1/export1/comp/jsn/users/jean/CR_Example/7014170/HelloWorld.java
http://sqeweb.sfbay.sun.com/net/sqenfs-1/export1/comp/jsn/users/jean/CR_Example/7014170/HelloWorld.jnlp
http://sqeweb.sfbay.sun.com/net/sqenfs-1/export1/comp/jsn/users/jean/CR_Example/7014170/HelloWorld2.jnlp