Multiple language installer using Inno Setup

Hi, not sure if this is the place to ask installer questions.

Anyway, i have an installer for my application which is built using Inno Setup.
Now i want to support multiple languages and i want the installer to give the user a drop-down box to choose the language.

My app uses a lot of common files for any language, but for some files such as a list of strings and help files there will be these files for each language.
The installer will contain all these files.

When the user has selected a language, it will then continue to install whatever it needs and then somehow only install the language specific files. This is what i do not know how to do.