Win XP Pro SP 3The .chm file opens & displays table of content, but all pages show error "cannot display this page".There is NO security warning on opening.There is NO "unblock" option in properties.Other .chm files run OK, some only AFTER unblocking, some after OK to security warning. Is there a registry fix? The only related issue on MS I have found suggests the two above fixes, and fixes for Server 2003. My problem is with a local file. Thanks for any suggestions. Eb

Hi, Are you referring to this article? You cannot open HTML Help files from Internet Explorer after you install security update 896358 or Windows Server 2003 Service Pack 1http://support.microsoft.com/kb/902225 See the “Applies to” section in the article – This article applies to Windows XP as well Method 1: You may refer the steps mentioned in the link belowhttp://blogs.msdn.com/b/neerajag/archive/2006/04/26/584144.aspx Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:How to back up and restore the registry in Windowshttp://support.microsoft.com/kb/322756/ Thanks and Regards:Ajay K Microsoft Answers Support Engineer---------------------------------------------------------------------------------------------------------Visit our Microsoft Answers Feedback Forum and let us know what you think