Security Assist Is compatible with the ASP server model.
The type of code generated by the wizard will be determined by a couple of factors:
1) The server model specified on the Testing Server tab of the site definition
2) The type of document that is open in Dreamweaver when you start the Wizard.
If you have a PHP page open when the wizard starts, it will generate PHP code.
Have this new ASP page open in Dreamweaver before starting the security assist wizard.