NSIS 是“Nullsoft 脚本安装系统”(Nullsoft Scriptable Installation System) 的缩写，它是一个免费的 Win32 安装、卸载系统，采用了简洁高效的脚本方式。它本来是一个由 Nullsoft 创建并用于作为 Winamp 及其插件发布的系统，但现已被上百个应用程序所应用，作为它们进行程序发布的工具。
Changes in version 2.21:
Major Changes:
* Added WinVer.nsh for easy Windows version comparisons
* Upgraded to lzma sdk 4.43 for faster compression
* Added WinVer.nsh for easy Windows version comparisons
* Upgraded to lzma sdk 4.43 for faster compression
Minor Changes:
* Added Vista support to GetWindowsVersion
* Added x64.nsh including a few simple macros for handling x64 installations
* Fixed a handle leak in Locate
* Minor documentation updates and fixes
* Modern UI 1.76: Added MUI_ABORTWARNING_CANCEL_DEFAULT (RFE #1547844)
* Added Vista support to GetWindowsVersion
* Added x64.nsh including a few simple macros for handling x64 installations
* Fixed a handle leak in Locate
* Minor documentation updates and fixes
* Modern UI 1.76: Added MUI_ABORTWARNING_CANCEL_DEFAULT (RFE #1547844)
New/Changed Commands:
* Added RequestExecutionLevel (RFE #1524709)
* Added RequestExecutionLevel (RFE #1524709)
Translations:
* Added Valencian translation (patch #1558822)
* Bulgarian corrections
* Slovenian corrections
* Added Valencian translation (patch #1558822)
* Bulgarian corrections
* Slovenian corrections
Build System:
* SCons requirement upgraded to 0.96.92
* SCons requirement upgraded to 0.96.92
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