The file needs to be copied to the following 2 locations:
Win Vista:
C:Users\<Your User Name>\AppData\Roaming\Adobe\Dreamweaver 9\Configuration\Behaviors\Actions\WA Validation Toolkit\Apply Client Validations
C:Users\<Your User Name>\AppData\Roaming\Adobe\Dreamweaver 9\Configuration\Commands
WinXP:
C:\Documents and Settings\<Your User Name>\Application Data\Adobe\Dreamweaver 9\Configuration\Behaviors\Actions\WA Validation Toolkit\Apply Client Validations
C:\Documents and Settings\<Your User Name>\Application Data\Adobe\Dreamweaver 9\Command