IS 5.5 to Dev 7.0 Basic conversion SRCDIR

We are starting a basic IS Professional 5.5 to Developer 7.0 conversion here and the first roadblock that we have encountered is a difference in behavior of the SRCDIR variable. It now contains the Windows system temp folder rather than the folder location of where the Setup.exe is located. Can anyone provide a method for obtaining the path to the folder where Setup.exe has been executed using IS 7.0 so that the script can look in that folder for other important associated files that have been passed along outside of the Setup.exe?

We have created a Setup.exe that contains all associated files within it, with Setup Launcher = Yes (no MSI engine included).

Thanks,
Don Rasmussen
EOS International
Carlsbad, Ca.

EOS

Stefan Krueger