I am evaluating IA against a specific set of requirements, and have a question about the standard and custom dialogs.
What I'm after is to be able to pass in a public property in the usual name/value format, and have the installer use this property to access an external file or URL to obtain the specified bitmap.
We have two products who’s installers are created from the same script. For these what we do is include both bitmaps in the dialog, and use the controlling compiler variable to hide the incorrect bitmap. It makes the installer slightly larger, but it was fairly easy to do.