How to block internet access from within a VFP executable

Hi all

I have a VFP executable (MyExecutable.EXE) which has a form containing an OLEBrowser control. I want to temporarily block internet access from this form using the Windows (7) firewall. I have created a new Outbound Rule pointing to MyExecutable.EXE but the form still loads and displays a web page.

Any ideas?

Many thanks

Paul Newton