how to get the \filter directory from registry (or other) during installation of the plugin

Hello

I made a script to install the plugin because it needs some libraries to be installed as well, but during the installation, the filter directory isn't defined (it isn't the same for each platform or language)

for example my filter folder is :

E:\Program_Files\Photoshop CS2\Modules externes\Filtres

how do i get this filter directory from registry (or with another way)

thanks a lot

Jeff