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Thumbnails in TS2 are based on various positioning stuff in the CRES, and they don't save as a picture, so I don't think you can extract them. I'm not sure if they show as pictures in the Thumbnail cache files, but if they do I don't think they'll show unless you've selected or recolored that particular object ingame.
Any reason why you need the thumbnail? It's possible whatever you need it for can be solved some other way.
If you need previews for something, one option is to take a screenshot of the thumbnails while ingame.