The BPA engine was used the the Desired Configuration Monitoring Feature Pack that was part of SMS 2003. This engine is no longer used in Desired Configuration Management. (Notice the Monitoring vs. Management for the M's).
The ConfigMgr 2007 Toolkit (
http://www.microsoft.com/downloads/details.aspx?FamilyID=948e477e-fd3b-4a09-9015-141683c7ad5f&DisplayLang=en ) does contain a tool to convert the SMS 2003 DCM templates to the ConfigMgr DCM format. This tool may or may not work for you.
Jason | http://myitforum.com/cs2/blogs/jsandys | http://blogs.catapultsystems.com/jsandys/default.aspx | Twitter @JasonSandys