Cultures that are specific to a country/region. The names of these cultures follow RFC 4646 (Windows Vista and later). The format is "<languagecode2>-<country/regioncode2>", where <languagecode2> is a lowercase two-letter code derived from ISO 639-1 and <country/regioncode2> is an uppercase two-letter code derived from ISO 3166. For example, "en-US" for English (United States) is a specific culture.