To achieve required visual effects we modified source files of Inno Setup installer. With every installation of Graphical Installer you install this modified version of Inno Setup. During install proces you may choose which version to install: ANSI (non Unicode) or UNICODE. If you have both versions of Inno Setup installed then you may install both versions of Graphical Installer. To see version of Inno Setup run application {Inno Setup 6}\Compile32.exe.

These files are modified:

• {Inno Setup 6}\Compil32.exe

  Inno Setup IDE.
  Source: Inno Setup website www.jrsoftware.org/.

• {Inno Setup 6}\ISCC.exe

  Inno Setup Compiler and Preprocessor. Preprocessor (required) will be used for compiling your .iss scripts in spite of fact you chose it during installation of Inno Setup 6 or not.
  Source: Inno Setup website www.jrsoftware.org/.

• {Inno Setup 6}\ISCmplr.dll

  Inno Setup compiler (dll).
  Source: Inno Setup website www.jrsoftware.org/.

• {Inno Setup 6}\ISPP.dll

  Inno Setup preprocessor (dll).
  Source: Inno Setup website www.jrsoftware.org/.

• {Inno Setup 6}\Setup.e32

  Inno Setup Wizard.
  Source: Inno Setup website www.jrsoftware.org/.

• {Inno Setup 6}\SetupLdr.e32

  Inno Setup Wizard loader.
  Source: Inno Setup website www.jrsoftware.org/.

• {Inno Setup 6}\Setup.e32

  Inno Setup Wizard.
  Source: Inno Setup website www.jrsoftware.org/.

Warning:
The only changes in these files are visual changes - there is no difference in functionality between regular Inno Setup 6 and these - modified - binary files.

There is one new file added: {Inno Setup 6}\GraphicalInstallerUI.e32. This file holds all required User Interface properties for proper drawing of skinned installers.

Original file {Inno Setup 6}\Setup.e32 was not modified: so you can create installers which looks exactly the same as your other installers.

See How does GraphicalInstallerUI work? for more info about this file.