You could either copy the script from the existing .qvw file and add the Excel load, or do a binary load of the .qvw file and then add the Excel file after that. Just make sure you have some kind of common key to link the Excel table to your data model and you'll be fine.
So you want to liberate youw QlikView application? One of my interest too! What I found on the www is the following:
You can access your data from a QVD-file in Excel. To do this you will need an plug-in for Excel from a third party (Vizubi?). Don't have experience with this particular plug-in, but if other Forum members do, I'd like to know.