Just for grins...

You may want to add "Additional" parameters to the main as InstallSheild is trying to force, just to get over the "nagging".

Then to a list memo to a text file and analyze what the values are...

Then, you can assess if based on single parameter and what the " format looks like in the parameters, then another conditional test for ' format via the install shield...

You may need to internally parse and/or add components together to get the final result.