This patch also includes a fix for Internet Explorer 6.0 SP1 that corrects the method by which Internet Explorer displays help information in the local computer zone. While we are not aware of a method to exploit this vulnerability by itself, if it were possible to exploit it, it could allow an attacker to read local files on a visiting user’s system. This patch also sets the Kill Bit on the Plugin.ocx ActiveX control which has a security vulnerability. This killbit has been set in order to ensure that the vulnerable control cannot be reintroduced onto users’ systems and to ensure that users who already have the vulnerable control on their system are protected. This issue is discussed further in Microsoft Knowledge Base Article 813489. Like the previous Internet Explorer cumulative patch released with bulletin MS03-004, this cumulative patch will cause window.showHelp( ) to cease to function if you have not applied the HTML Help update. If you have installed the updated HTML Help control from Knowledge Base article 811830, you will still be able to use HTML Help functionality after applying this patch.