[soniclemolasson]

Thank you for your answer. I managed to extract all the content using Universal extractor. For instance, this setup has been created using Inno Setup Installeur (information given by Universal Extractor).

Now that i managed to extract those file... I have to find a way to :
1) Re-insert them
OR
2) Re-create the setup structure

Edit : Extracting the setup.exe with Universal Extractor gave me the Inno Setup code file