Unicode installers
From Nullsoft Scriptable Install System
1.4 Unicode installers
Starting with NSIS v3.0 you can choose to create Unicode installers by setting the Unicode attribute. These installers will not work on Windows 95/98/ME but they will allow you to display your installer in any Unicode language supported by the OS.
When building a Unicode installer NSIS variables can hold Unicode characters (0001-FFFF). There should be no need to modify your existing scripts. If you want to read/write Unicode files, specific instructions have been added to read/write UTF-16LE strings from/to disk.