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In windows 7 by default ISAPI & CGI Restrictions are not configured. To enable ISAPI & CGI restrictions, GoTo -> Control Panel -> Programs -> Click on "Windows features on or off -> Expand Internet Information Services - >Expand World Wide Web Services ->Select CGI and ISAPI extensions and Click OK. After enabling, Check in IIS, Open your IIS and the feature will be available. What is ISAPI and CGI restrictions : ISAPI and CGI restrictions are request handlers that allow dynamic content to execute on a server. These restrictions are either CGI files (.exe) or ISAPI extensions (.dll). You can add custom ISAPI or CGI restrictions if the IIS configuration system allows this.