At the end of the installation, there is a checkbox determining whether the
readme gets displayed. However, even if there is a check mark in the checkbox,
the readme isn't displayed under Windows Vista 32-bit (tested on the "Home
Premium" version).
To me, it seems the reason is that the NSIS installer generator used to make
the installer executable dates from before Windows Vista was released. It
reads "Nullsoft Install System 2.19-3", whereas the latest version is 2.34.