Uninstaller signing

I found the following post: http://nsis.sourceforge.net/Signing_an_Uninstaller

However I am wondering how I can extract it on a POSIX machine? Isn't the installer a physical file inside the installation package? Can't ir be extracted using zip?

Thanks,
Yves

The uninstaller is generated on the fly by the installer. You can use WINE to run your installer on POSIX.