Article ID: 878461
Important This article contains information that shows you how to help lower security settings or how to turn off security features on a computer. You can make these changes to work around a specific problem. Before you make these changes, we recommend that you evaluate the risks that are associated with implementing this workaround in your particular environment. If you implement this workaround, take any appropriate additional steps to help protect your system.
When you open an HTML file in a program after you install Microsoft Windows XP Service Pack 2 (SP2), one of the following issues may occur:
These issues may be caused by an enhanced security feature that is included in Windows XP SP2. This enhanced security feature helps protect your computer from attacks by malicious users or by malicious software, such as computer viruses. By default, this feature is turned on in the registry.
Warning This workaround may make your computer or your network more vulnerable to attack by malicious users or by malicious software such as viruses. We do not recommend this workaround but are providing this information so that you can implement this workaround at your own discretion. Use this workaround at your own risk.
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:
(http://support.microsoft.com/kb/322756/ )How to back up and restore the registry in Windows
To work around these issues, change the value of the
FEATURE_LOCALMACHINE_LOCKDOWNsubkey to 0.
Note By default, the value of the
FEATURE_LOCALMACHINE_LOCKDOWNsubkey is set to 1 in Windows XP SP2.
To do this, follow these steps:
When the value of the
FEATURE_LOCALMACHINE_LOCKDOWNsubkey is set to 1, the following restrictions are enforced by Windows XP SP2 for both Microsoft Internet Explorer and Microsoft Windows Explorer: