Every Inno Setup installer is stored in a .iss file. Script
files are usually edited using external application. After you have
finishing writing the script, the next and final step is called
"Compilation" in the Setup Compiler.
Compiler creates a complete, ready-to-run Setup program based on
your script. By default, this is created in a directory named
"Output" under the directory containing the script.
For more information about Inno Setup script format see Inno Setup
When you use Graphical Installer
Wizard for creating Graphical Installer powered installers it
will generate such .iss file. This file represents your installer.
It does not matter how this file is called - we will call it
Graphical Installer powered installer use another file called
<project>.graphics.iss which contains aditional data
required for proper initialization of Graphical Installer skinning
engine. All Graphical Installer powered installers MUST contain
these two files (also they must be in the same directory!). If one
of this files is missing, the installer will not be skinned
The biggest advantage of Graphical Installer powered installers is
the fact that is it really simple to add/remove skinning mechanism
from .iss file.
Whole skinning mechanism can be removed by commenting out
If this symbol is defined, appropriate values are loaded from
file and function are called.
Typically this file looks like this:
The most important part is the [Code] section. There you can
find procedures InitializeWizard();
CurPageChanged(CurPageID: Integer); and
DeInitializeSetup(); which take care about drawing in
Graphical Installer. In these 3 procedures all Graphical Installer
drawing is processed. As you can see there are only 3 new lines to
All settings (colors, pictures, etc) are defined in <project>.graphics.iss
so your script file will not be choked with foreign code.