SWI-Prolog -- win_get_user_preferred_ui

Documentation
- Reference manual
  - Built-in Predicates
    - Operating System Interaction
      - Windows-specific Operating System Interaction
        
        win_exec/2
        
        win_shell/3
        
        win_shell/2
        
        win_registry_get_value/3
        
        win_folder/2
        
        win_add_dll_directory/1
        
        win_add_dll_directory/2
        
        win_remove_dll_directory/1
        
        win_process_modules/1
        
        win_get_user_preferred_ui_languages/2
- Packages

win_get_user_preferred_ui_languages(+Format, -Languages)

Unifies Languages with a list of the user preferred languages (Windows Display Languages) in order of preference. If Format is name, the list elements are atoms. See Language Names for details. If Format is id, Languages is a list of numeric language ids represented as Prolog integers. This predicate provides Windows alternative to setlocale/3 using the category messages.