password_tool.bat generates java.lang.ClassNotFoundException

The password_tool.bat command found in $JBOSS_HOME%\bin generates a java.lang.ClassNotFoundException:

C:\JBPAPP\jboss-eap-5.1\jboss-as\bin>password_tool.bat
**********************************

• • • • JBoss Password Tool********
        **********************************
        Error while trying to load data:Encrypted password file not located
        Maybe it does not exist and need to be created.
        0: Encrypt Keystore Password 1:Specify KeyStore 2:Create Password 3: Remove a domain 4:Enquire Domain 5:Exit
        0
        Enter Keystore password
        testpass
        Enter Salt (String should be at least 8 characters)
        hshdgfdjdekjdsd,md
        Enter Iterator Count (integer value)
        4
        Exception in thread "main" java.lang.NoClassDefFoundError: org/jboss/security/plugins/FilePassword
        at org.jboss.security.integration.password.PasswordTool.main(PasswordTool.java:104)
        Caused by: java.lang.ClassNotFoundException: org.jboss.security.plugins.FilePassword
        at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
        ... 1 more
        org.jboss.security.integration.password.PasswordTool$ShutdownHook run called
        Keystore is null. Cannot store.

THis exception occurs on Windows but does not occur on Linux.
It seems to be a simple classpath problem in the script.