Huh? Am I missing something here? It looks like you have a Diablo chip based on your signature. Why would you send someone your stock tune? The vendor should already know what it is. Are you talking about sending someone your ECU for reflashing? And why not just reburn your Diablo chip?
My Diablo tuner ask for this when I wanted a custom tune, so I sent it to him.
Download the stock tune from the predator to your PC, save the file with your VIN number in the file name. E-mail it to your tuner. Just reverse the procedure when you get your tune back; works great!