The following language strings are recognized by setlocale. Any language not supported by the operating system is not accepted by setlocale. The three-letter language-string codes are only valid in Windows 98, Windows Me, Windows NT, Windows 2000, and Windows XP.
| Primary language | Sublanguage | Language string |
|---|---|---|
| Chinese | Chinese | \"chinese\" |
| Chinese | Chinese (simplified) | \"chinese-simplified\" or \"chs\" |
| Chinese | Chinese (traditional) | \"chinese-traditional\" or \"cht\" |
| Czech | Czech | \"csy\" or \"czech\" |
| Danish | Danish | \"dan\" or \"danish\" |
| Dutch | Dutch (default) | \"dutch\" or \"nld\" |
| Dutch | Dutch (Belgian) | \"belgian\", \"dutch-belgian\", or \"nlb\" |
| English | English (default) | \"english\" |
| English | English (Australian) | \"australian\", \"ena\", or \"english-aus\" |
| English | English (Canadian) | \"canadian\", \"enc\", or \"english-can\" |
| English | English (New Zealand) | \"english-nz\" or \"enz\" |
| English | English (United Kingdom) | \"eng\", \"english-uk\", or \"uk\" |
| English | English (United States) | \"american\", \"american english\", \"american-english\", \"english-american\", \"english-us\", \"english-usa\", \"enu\", \"us\", or \"usa\" |
| Finnish | Finnish | \"fin\" or \"finnish\" |
| French | French (default) | \"fra\" or \"french\" |
| French | French (Belgian) | \"frb\" or \"french-belgian\" |
| French | French (Canadian) | \"frc\" or \"french-canadian\" |
| French | French (Swiss) | \"french-swiss\" or \"frs\" |
| German | German (default) | \"deu\" or \"german\" |
| German | German (Austrian) | \"dea\" or \"german-austrian\" |
| German | German (Swiss) | \"des\", \"german-swiss\", or \"swiss\" |
| Greek | Greek | \"ell\" or \"greek\" |
| Hungarian | Hungarian | \"hun\" or \"hungarian\" |
| Icelandic | Icelandic | \"icelandic\" or \"isl\" |
| Italian | Italian (default) | \"ita\" or \"italian\" |
| Italian | Italian (Swiss) | \"italian-swiss\" or \"its\" |
| Japanese | Japanese | \"japanese\" or \"jpn\" |
| Korean | Korean | \"kor\" or \"korean\" |
| Norwegian | Norwegian (default) | \"norwegian\" |
| Norwegian | Norwegian (Bokmal) | \"nor\" or \"norwegian-bokmal\" |
| Norwegian | Norwegian (Nynorsk) | \"non\" or \"norwegian-nynorsk\" |
| Polish | Polish | \"plk\" or \"polish\" |
| Portuguese | Portuguese (default) | \"portuguese\" or \"ptg\" |
| Portuguese | Portuguese (Brazilian) | \"portuguese-brazil\" or \"ptb\" |
| Russian | Russian (default) | \"rus\" or \"russian\" |
| Slovak | Slovak | \"sky\" or \"slovak\" |
| Spanish | Spanish (default) | \"esp\" or \"spanish\" |
| Spanish | Spanish (Mexican) | \"esm\" or \"spanish-mexican\" |
| Spanish | Spanish (Modern) | \"esn\" or \"spanish-modern\" |
| Swedish | Swedish | \"sve\" or \"swedish\" |
| Turkish | Turkish | \"trk\" or \"turkish\" |