NSIS is "Nullsoft Scriptable Installation System" acronym, it is also being called a free Win32 install, uninstall system that uses a simple and efficient way to script. It was originally a Nullsoft Winamp created and used as its plug release system, but has now been applied in hundreds of applications, as they released a tool for program.
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In one word, NSIS (Nullsoft Scriptable Install System) is a professional open source system to create Windows installers.
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Nullsoft Scriptable Install System (NSIS) Software Features:
Created with NSIS installer can install, uninstall, setting system settings, extracting files, etc. Can do almost everything. Because it is based on a script file, so you can completely control your every part of the installation process. Its scripting language supports variables, functions, string handling, like an ordinary programming language - but it is only designed to create the installer.