American Airlines Virtual

I'm having a problem with my night ground textures and I would like to install the default night ground textures and then reinstall my addons but I don't want to reinstall my FS9.How would I go about doing this? The problem I'm having is the grid around the airport has a different night texture from the rest of the night textures and it's only around airports.I installed FS9 on my laptop so I could extract the default ground night textures but I don't know which files exactly to extract,any help will be appreciated.