Automatic configuration does not support certain file types in Internet Explorer 8.0

Source: Microsoft Support

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Windows Internet Explorer 8 fails to download and process the automatic configuration script that is�specified in the Local Area Network (LAN) Settings dialog box.

Automatic Configuration no longer supports the following file types in Internet Explorer 8:

• .INS
• .CAB
• .JS
• .JVS

Note .WPAD and .PAC file types are still supported.

As a result of this, Internet Explorer Administration Kit (IEAK) 8 no longer supports customizing .INS, .JS, or .JVS file types. The Automatic Configuration dialog of the IEAK8 will not block adding these files types, however, such customizations will not be applied to Internet Explorer 8.

To customize user's machines after deployment, deploying IEAK8 generated Configuration-only packages via Active Directory or Systems Management Server (SMS) is recommended. Group Policy can also be used to enforce customizations on user�s machines after deployment.

Please note that applications dependent on WinHTTP may be affected by this change, if the Automatic Configuration script was previously used to set the AutoConfigJSURL registry key.

For more information, see the following article in the Microsoft Knowledge Base:

919477�WinHTTP may not connect through a proxy server if proxy auto-configuration is used for Internet Explorer connectivity in Windows XP.

For more information, click the following article number to view the article in the Microsoft Knowledge Base: