GfxUI Settings Lost on Re-Boots - Where are GfxUI files?

Hi,

I set up various graphics properties via GfxUI. Sometimes these settings seem to be lost on re-boot. I would like to be able to copy/backup the files GfxUI uses to store these settings so that I can easily restore them. What are the files used to store GfxUI's configuration parameters and where are they?

Thanks,

Nefeco.