I coded a CMS for a client everything is ok except client said:

Use his previous shopping cart and embed that into the new design. The previous shopping cart file is shopper.cgi and I want to submit my form to that shopper.cgi

When I do this the file open dialog opens asking me to save the file or open the file. 

Can someone suggest how can I make my form submit to shopper.cgi? I am running wamp server than ks