Nullsoft Installation System 是一个小巧高效的安装软件。可通过样例修改或根据自己要求编写 NSI 脚本文件来定制自己的安装系统，可实现许可协议的显示、安装类型的选择、写入注册表、写入INI文件、连接程序外壳、语句跳转、提示信息显示、创建卸载程序、定制安装和卸载程序的图标、创建快捷方式等其他安装程序应有的功能，是一款操作简单、功能强大的高效率安装软件精品。
Generates self-contained executable installers
Support for ZLib, BZip2 and LZMA data compression (files can be compressed individually or together)
Uninstall support (installer can generate an uninstaller)
Customizable user interface (dialogs, fonts, backgrounds, icons, text, checkmarks, images etc.)
Classic and Modern wizard interface
Fully multilingual, support for multiple languages (including RTL langauges) in one installer. More than 40 translations are already available, but you can also create your own.
Page system: You can add standard wizard pages or custom pages
User selection of installation components, tree for component selection
Multiple install configurations (usually Minimal, Typical, Full), and custom configuration
Installer self-verification using a CRC32 checksum
Small overhead over compressed data size (34 KB with default options)
Ability to display a license agreement in text or RTF format
Ability to detect destination directory from the registry
Easy to use plug-in system (lots of plug-ins for creation of custom dialogs, internet connections, HTTP downloading, file patching, Win32 API calls, etc. are included)
Installers can be as large as 2GB
Optional silent mode for automated installations
A preprocessor with support for defined symbols, macros, conditional compilation, standard predefines
A lovely coding experience with elements of PHP and assembly (includes user variables, a stack, real flow control, etc.)
Installers have their own VMs that let you write code that can support:
File extraction (with configurable overwrite parameters)
File/directory copying, renaming, deletion, searching
Plug-in DLL calling
DLL/ActiveX control registration/unregistration
Executable execution (shell execute and wait options)
Shortcut creation
Registry key reading/setting/enumerating/deleting
INI file reading/writing
Generic text file reading/writing
Powerful string and integer manipulation
Window finding based on class name or title
User interface manipulation (font/text setting)
Window message sending
User interaction with message boxes or custom pages
Branching, comparisons, etc.
Error checking
Reboot support, including delete or rename on reboot
Installer behavior commands (such as show/hide/wait/etc.)
User functions in script
Callback functions for user actions
Completely free for any use. See License.
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