Ah, I see.
Ok, not sure about this to be honest, but have you looked at the JetStress tools?
They prepare databases before running database stress tests. I am not sure if they load the STM file but might be worth a look.
Let me know how things go, if you haven't got any further I will see if I can get someone else to take a look at the problem.
Cheers
Nathan
Nathan Winters - MVP Exchange Server
MCSE & MCSA 2000 & 2003 + Messaging, MCITP Exchange 2007, MCP, VMWare VCP v2 & v3.
Welcome to the Microsoft Messaging and Mobility User Group: http://www.mmmug.co.uk