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Starting with Windows Vista, it is possible for a particular language to correspond to a supplemental locale, which is a type of custom locale.

The operating system implements a neutral language by selecting the data for the locale associated with a specific version of the language, usually the most widespread locale. Implementation of a language requires a corresponding locale. An application can override either default by using the SetThreadLocale function to explicitly set the locale for a thread. This locale is defined by LOCALE_USER_DEFAULT. When running a thread in a process belonging to the user, the operating system assigns the "user default locale" to the thread. This locale is set when the operating system is installed or when the user selects it using the regional and language options portion of the Control Panel. The operating system assigns a locale to each thread, initially assigning the "system default locale," defined by LOCALE_SYSTEM_DEFAULT. Locale information types are described in Locale Information Constants. Each locale has a variety of information associated with it, other than its name and identifier. An example of a locale name for German (Germany) is "de-DE_phonebook".Įach operating system has at least one installed locale and often has many locales from which the user can select. Each locale is defined by a language and a sort order, and has both a locale name and a locale identifier.

Windows XP supports more than 150 locales, and Windows Vista supports about 200. For example, the locale English (United States) has the language name "en-US".Ī "locale" is a collection of language-related user preference information represented as a list of values. A more geographically specific language can be indicated by a name that includes both locale and country/region information. A neutral language is indicated by a name such as "en" for English. Each language has a language name and a language identifier that indicate the particular code page (ANSI, DOS, Macintosh) used to represent the geographical location for the language on the operating system. The term "language" indicates a collection of properties used in spoken and written communication.