Use innounp.exe to unpack setup.exe created by using Inno setup:
for example, unpack all the files wrapped inside setup.exe to a folder named unpacked inside the current directory.
>innounp.exe -x -dunpacked setup.exe
For more information about innounp.exe, please see http://innounp.sourceforge.net/
_____________________________________________________________________________________________
Following content is reprinted from this link: http://www.jrsoftware.org/iskb.php?extract
FAQ: Can I manually extract files or other information from a compiled setup.exe?
Article Created: 2003-11-17 20:21 GMT by Jordan Russell
Last Updated: 2004-11-30 06:02 GMT by Jordan Russell
There is no officially supported method, but a third-party tool called innounp exists which claims to be able to do this.
____________________________________________________________________________________