The area you tried to access is a folder containing data files for a CGI script. The folder is protected from web browsing, because some of the data may be sensitive information.
To enable web browsing, locate the file in the root data folder named ".htaccess". Open the file and make sure that it's the right one - the right one will have an ErrorDocument 403 handler pointing to this URL. If you want to enable web browsing, rename this ".htaccess" file to ".htaccess.foo".