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