Decompiler for setups creates with the Nullsoft Installer
...It's currently in the 'alpha-state' however it's not far from being worth to title as beta or release.
I'm new to Sourceforge - for small updates I may also prefer the page below.
UPDATE: It'll maybe not working on this anymore. http://7-zip.de does a great job in also decompiling NSI.So I recommand you to check out 7-zip BETA.
Generally 7-zip opens NSI[exe] files - since 9.33 [2014-06-15] there should be additionally the file [NSIS].nsi inside, that is the decompiled setup script.
Attention this NSIS decompilation was disabled in 7z 15.06.
So last version that officially **supports NSIS Script decompilation** is 7z **15.05**
https://sourceforge.net/projects/sevenzip/files/7-Zip/15.05/ (2015-06-15)
-> 7-zip 15.10 no longer decompiles NSIS script
http://bit.do/7zNoMoreNSIS
^-however doing a private build you may get it back(more details in the post).
MEDDAC is the seeding point for designing a new approach to Operating System design itself. It is an Open Source project with roots in mainframe design and development the author began in 1979. Monitor Editor Disassembler Decompiler Assembler Compiler
The aim of this project is to develope a decompiler for java which is platform independent and has options to obfuscate the class file also.
The project takes class file as input and decompiles it and provides the source file.