Using the "Documents" directory with the installer

Hi guys

I've tried to find if there is anything similar to my question, but couldn't, so here goes:

How can I make the installer install some files, that will be used as user specific setting and that I'd prefer not to be deleted on uninstall, to the "Documents" directory (x:\Documents\BlaBla)?

The question is simple, but I can't find the answer. The app can save to that directory, but there are some files that have to be copied there before starting the application for the first time.

Thanks