I am installing a self-extracting exe in my installation (containing ~2000 files) and would like to automate its extraction in the install script. The developer hard-coded a target directory when he created the exe, but I would like to pass the user's selected TARGETDIR as well as the command to extract during OnFirstUIAfter.
I have attempted "/extract_all:<path>" from a cmd prompt as a test, but all that occurs is that the Unzip window allowing one to browse, unzip, etc is opened. Now, perhaps it is not unreasonable to ask the user to do this during the install process, but is there a way to do this behind the scenes? This is of course more a WinZip question than an InstallShield one, but I have thus far had no luck there, and figure that perhaps someone here has dealt with this.

Thanks for any suggestions or information.