To retrieve the original files from Tiki with their file names instead of the random hash from the database tables you can try this "dirty" command line stuff from chris2 (provided via IRC, thanks):
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mysql host=yourdbhost user=dbuser password=secret -D dbname -B raw <<<'select f.path, g.name, f.filename from tiki_files f, tiki_file_galleries g where f.galleryId = g.galleryId' | sed "s:^:install -D files/:;s:\t: 'export/:;s:\t:/:;s:$:':" | sh
mysql host=yourdbhost user=dbuser password=secret -D dbname -B raw <<<'select f.path, g.name, f.name from tiki_images f, tiki_galleries g where f.galleryId = g.galleryId' | sed "s:^:install -D files/:;s:\t: 'export/images/:;s:\t:/:;s:$:':" | sh