[robi-bobi]

sa php.net/setlocale:

Tip: Windows users will find useful information about locale strings at Microsoft's MSDNwebsite. Supported language strings can be found at http://msdn.microsoft.com/library/de...ge_strings.asp and supported country/region strings at http://msdn.microsoft.com/library/de...ry_strings.asp. Windows systems support the three letter codes for country/region specified by ISO 3166-Alpha-3, which can be found at this Unicode website .

edit:
samo da napomenem da sam setlocale koristio u jednom projektu koji je imao 10-tak jezika, nije bilo nikakwih problema (unix environment)