Multiple versions of excel

I have excel 2000, 2003, 2007 installed on my machine.

I have an access app that creates excel reports. It opens my template up which was developed in excel 2003 but it opens it using excel 2007. I want it to open it in excel 2003.

This is how I create the object:
Set objExcel = CreateObject("Excel.Application")

is there a place in the registry that I can change the association "Excel.Application" from excel 2007 to 2003?