Here the source files exist outside of the MSI file and are referred to using a relative path. This means that you can edit the WSI file and recompile without having to install the application. All you need is a PC with Wise Package Studio or its Client (aka WPSClient.exe) installed.
-Click Projects tab
-Click on Run beside Edit Package
-Do your changes
-Save the WSI.
-Click Compile to create an updated MSI file.