In order to call FoxWeb requests on host names other than localhost you must add an entry for each host name in the virtual servers grid of the FoxWeb Control Center.  For more details please refer to the FoxWeb Configuration page in the documentation.

The URL you are trying to use is incorrect, unless you installed foxweb.exe in your Web root.  Try using http://localhost/scripts/foxweb.dll/show_cgi, or simply http://localhost/show_cgi.fwx.  The FoxWeb readme file has enough information to get you started.  If you need additional details on how to configure your Web server and how to form your URLs please refer to the following chapters in the FoxWeb documentation:
- Configuring your Web Server
- Locating and Addressing Scripts

FoxWeb Support Team
support@foxweb.com