Recently I installed Excel 2007 on my PC that also has Excel 2003. When I
import data into Excel from a financial systems software package, Excel 2007
launches to import the data extract, but Excel 2007 does not have an
integration (yet) with this other system. This aborts the import process.

I haven't found a way to let Excel 2003 take control in this use-case. Excel
2003 will import the data without issue if I can make it the "default" client
application.

I need to have both versions of Excel so that I can be compatible with
others so uninstalling either version is not an option.

Is there a config setting somewhere that can be set so that Excel 2007 is
not the app which automatically attempts to receive the data? The type of
resolution I am looking for is how to "control" which version of Excel
launches so that I can make Excel 2003 import the data and not Excel 2007.

Any ideas, thoughts, or guidance?