Modify Administrative Templates settings in Local Group Po..

Hi, I would like to change the default settings of Administrative Templates
on target machine programmatically. For example, one of the settings is:
Local Policy\Computer Configuration\Administrative Templates\Network\Network
Connections\Windows Firewall\Domain Profile\Window Firewall: Do not allow
exception.

After searching online, I realize that all the administrative settings
stored in registry.pol. Is there a way that we can modify this binary file
programmatically?
Aditional info: the target machine is a groupwork box and not allow to
connect to DC at anytime.

Thanks for your help.