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Another nice freeware alternative and portable GUI for InnoUnp called InnoEx - http://fec.ct8.pl/blog/innoex/
Notable difference is the paid feature 'Identify encrypted files' on InnoExtractor is free on InnoEx.

Moved to http://fec.usermd.net/innoex/Userfriendly wrote:Another nice freeware alternative and portable GUI for InnoUnp called InnoEx - http://fec.ct8.pl/blog/innoex/
http://fec.usermd.net/innoex_changelog/•Some parts of program were rewritten for better performance and responsibility.
•Improvements for detecting/opening Inno Setup installers in InnoEx (new custom option "ForceISLoad" will let you adjust this to your needs / more info).
•Improvements for External editors.
•Improvements for Viewer.
•Small improvements for opening bundled installers.
•Small improvements for searching on main list (which is also much faster now).
•Improvements for Pascal script disassembler (added support for scripts compiled with old ROPS version).
•Updated InnoUnp to version 0.43 (with support for fast detecting encrypted files / more info).
•Small changes and code optimization in shell extension (read this if you are using it or want to use).
•Added new function for automatically detecting bundled installers (requested / more info).
•Added new feature for detecting Inno Setup installers - similar to researcher from InnoExtractor (requested / more info).
•Additional custom options (some requested, some other invented by me / more info).
•Fixed potential error that could happen in some rare cases while opening bundled installers.
•Fixed problem when extract directory passed to InnoUnp was ended with spaces.
•Fixed some problems with shortcuts.
•Fixed few other small bugs.
•Many other small changes/improvements.
InnoEx does one thing- it extracts Inno Setup installers, but it does it well:I know this question is much too late, but what is this program for? Just innonup decompression? Can it replace UniExtract? I'd like to add some detail in the entry to that effect.
InnoEx features:InnoEx is a small and simple GUI for InnoUnp to view and extract resources from Inno Setup installers.
It can detect bundled installers:Features:
- Fast with big setups, with many files
- Easy to use
- Ability to view/dump registry and ini section
- Pascal script disassembler (optional)
- Ability to extract files according to chosen language (include/exclude/rename files)
- Drag and drop (both ways)
- Shell extension (optional)
- No crapware included
- Portable