In case you need to determine what language was Windows OS/Server installed run following script in powershell:
Get-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Control\Nls\Language" | Select-Object InstallLanguage
Compare returned HEX value from powershell with this table:
| Hex | Dec | Country code | Meaning |
|---|---|---|---|
| 0004 | 4 | zh-CHS | Chinese – Simplified |
| 0401 | 1025 | ar-SA | Arabic – Saudi Arabia |
| 0402 | 1026 | bg-BG | Bulgarian – Bulgaria |
| 0403 | 1027 | ca-ES | Catalan – Spain |
| 0404 | 1028 | zh-TW | Chinese (Traditional) – Taiwan |
| 0405 | 1029 | cs-CZ | Czech – Czech Republic |
| 0406 | 1030 | da-DK | Danish – Denmark |
| 0407 | 1031 | de-DE | German – Germany |
| 0408 | 1032 | el-GR | Greek – Greece |
| 0409 | 1033 | en-US | English – United States |
| 040A | 1034 | es-ES_tradnl | Spanish – Spain |
| 040B | 1035 | fi-FI | Finnish – Finland |
| 040C | 1036 | fr-FR | French – France |
| 040D | 1037 | he-IL | Hebrew – Israel |
| 040E | 1038 | hu-HU | Hungarian – Hungary |
| 040F | 1039 | is-IS | Icelandic – Iceland |
| 0410 | 1040 | it-IT | Italian – Italy |
| 0411 | 1041 | ja-JP | Japanese – Japan |
| 0412 | 1042 | ko-KR | Korean – Korea |
| 0413 | 1043 | nl-NL | Dutch – Netherlands |
| 0414 | 1044 | nb-NO | Norwegian (Bokmål) – Norway |
| 0415 | 1045 | pl-PL | Polish – Poland |
| 0416 | 1046 | pt-BR | Portuguese – Brazil |
| 0417 | 1047 | rm-CH | Romansh – Switzerland |
| 0418 | 1048 | ro-RO | Romanian – Romania |
| 0419 | 1049 | ru-RU | Russian – Russia |
| 041A | 1050 | hr-HR | Croatian – Croatia |
| 041B | 1051 | sk-SK | Slovak – Slovakia |
| 041C | 1052 | sq-AL | Albanian – Albania |
| 041D | 1053 | sv-SE | Swedish – Sweden |
| 041E | 1054 | th-TH | Thai – Thailand |
| 041F | 1055 | tr-TR | Turkish – Turkey |
| 0420 | 1056 | ur-PK | Urdu – Pakistan |
| 0421 | 1057 | id-ID | Indonesian – Indonesia |
| 0422 | 1058 | uk-UA | Ukrainian – Ukraine |
| 0423 | 1059 | be-BY | Belarusian – Belarus |
| 0424 | 1060 | sl-SI | Slovenian – Slovenia |
| 0425 | 1061 | et-EE | Estonian – Estonia |
| 0426 | 1062 | lv-LV | Latvian – Latvia |
| 0427 | 1063 | lt-LT | Lithuanian – Lithuanian |
| 0428 | 1064 | tg-Cyrl-TJ | Tajik (Cyrillic) – Tajikistan |
| 0429 | 1065 | fa-IR | Persian – Iran |
| 042A | 1066 | vi-VN | Vietnamese – Vietnam |
| 042B | 1067 | hy-AM | Armenian – Armenia |
| 042C | 1068 | az-Latn-AZ | Azeri (Latin) – Azerbaijan |
| 042D | 1069 | eu-ES | Basque – Basque |
| 042E | 1070 | hsb-DE | Upper Sorbian – Germany |
| 042F | 1071 | mk-MK | Macedonian – Macedonia |
| 0432 | 1074 | tn-ZA | Setswana / Tswana – South Africa |
| 0434 | 1076 | xh-ZA | isiXhosa – South Africa |
| 0435 | 1077 | zu-ZA | isiZulu – South Africa |
| 0436 | 1078 | af-ZA | Afrikaans – South Africa |
| 0437 | 1079 | ka-GE | Georgian – Georgia |
| 0438 | 1080 | fo-FO | Faroese – Faroe Islands |
| 0439 | 1081 | hi-IN | Hindi – India |
| 043A | 1082 | mt-MT | Maltese – Malta |
| 043B | 1083 | se-NO | Sami (Northern) – Norway |
| 043e | 1086 | ms-MY | Malay – Malaysia |
| 043F | 1087 | kk-KZ | Kazakh – Kazakhstan |
| 0440 | 1088 | ky-KG | Kyrgyz – Kyrgyzstan |
| 0441 | 1089 | sw-KE | Swahili – Kenya |
| 0442 | 1090 | tk-TM | Turkmen – Turkmenistan |
| 0443 | 1091 | uz-Latn-UZ | Uzbek (Latin) – Uzbekistan |
| 0444 | 1092 | tt-RU | Tatar – Russia |
| 0445 | 1093 | bn-IN | Bangla – Bangladesh |
| 0446 | 1094 | pa-IN | Punjabi – India |
| 0447 | 1095 | gu-IN | Gujarati – India |
| 0448 | 1096 | or-IN | Oriya – India |
| 0449 | 1097 | ta-IN | Tamil – India |
| 044A | 1098 | te-IN | Telugu – India |
| 044B | 1099 | kn-IN | Kannada – India |
| 044C | 1100 | ml-IN | Malayalam – India |
| 044D | 1101 | as-IN | Assamese – India |
| 044E | 1102 | mr-IN | Marathi – India |
| 044F | 1103 | sa-IN | Sanskrit – India |
| 0450 | 1104 | mn-MN | Mongolian (Cyrillic) – Mongolia |
| 0451 | 1105 | bo-CN | Tibetan – China |
| 0452 | 1106 | cy-GB | Welsh – United Kingdom |
| 0453 | 1107 | km-KH | Khmer – Cambodia |
| 0454 | 1108 | lo-LA | Lao – Lao PDR |
| 0456 | 1110 | gl-ES | Galician – Spain |
| 0457 | 1111 | kok-IN | Konkani – India |
| 0459 | 1113 | sd-Deva-IN | (reserved) – (reserved) |
| 045A | 1114 | syr-SY | Syriac – Syria |
| 045B | 1115 | si-LK | Sinhala – Sri Lanka |
| 045C | 1116 | chr-Cher-US | Cherokee – Cherokee |
| 045D | 1117 | iu-Cans-CA | Inuktitut (Canadian_Syllabics) – Canada |
| 045E | 1118 | am-ET | Amharic – Ethiopia |
| 0461 | 1121 | ne-NP | Nepali – Nepal |
| 0462 | 1122 | fy-NL | Frisian – Netherlands |
| 0463 | 1123 | ps-AF | Pashto – Afghanistan |
| 0464 | 1124 | fil-PH | Filipino – Philippines |
| 0465 | 1125 | dv-MV | Divehi – Maldives |
| 0468 | 1128 | ha-Latn-NG | Hausa – Nigeria |
| 046A | 1130 | yo-NG | Yoruba – Nigeria |
| 046B | 1131 | quz-BO | Quechua – Bolivia |
| 046C | 1132 | nso-ZA | Sesotho sa Leboa – South Africa |
| 046D | 1133 | ba-RU | Bashkir – Russia |
| 046E | 1134 | lb-LU | Luxembourgish – Luxembourg |
| 046F | 1135 | kl-GL | Greenlandic – Greenland |
| 0470 | 1136 | ig-NG | Igbo – Nigeria |
| 0473 | 1139 | ti-ET | Tigrinya – Ethiopia |
| 0475 | 1141 | haw-US | Hawiian – United States |
| 0478 | 1144 | ii-CN | Yi – China |
| 047A | 1146 | arn-CL | Mapudungun – Chile |
| 047C | 1148 | moh-CA | Mohawk – Canada |
| 047E | 1150 | br-FR | Breton – France |
| 0480 | 1152 | ug-CN | Uyghur – China |
| 0481 | 1153 | mi-NZ | Maori – New Zealand |
| 0482 | 1154 | oc-FR | Occitan – France |
| 0483 | 1155 | co-FR | Corsican – France |
| 0484 | 1156 | gsw-FR | Alsatian – France |
| 0485 | 1157 | sah-RU | Sakha – Russia |
| 0486 | 1158 | quc-Latn-GT | K’iche – Guatemala |
| 0487 | 1159 | rw-RW | Kinyarwanda – Rwanda |
| 0488 | 1160 | wo-SN | Wolof – Senegal |
| 048C | 1164 | prs-AF | Dari – Afghanistan |
| 0491 | 1169 | gd-GB | Scottish Gaelic – United Kingdom |
| 0492 | 1170 | ku-Arab-IQ | Central Kurdish – Iraq |
| 0801 | 2049 | ar-IQ | Arabic – Iraq |
| 0803 | 2051 | ca-ES-valencia | Valencian – Valencia |
| 0804 | 2052 | zh-CN | Chinese (Simplified) – China |
| 0807 | 2055 | de-CH | German – Switzerland |
| 0809 | 2057 | en-GB | English – United Kingdom |
| 080A | 2058 | es-MX | Spanish – Mexico |
| 080C | 2060 | fr-BE | French – Belgium |
| 0810 | 2064 | it-CH | Italian – Switzerland |
| 0813 | 2067 | nl-BE | Dutch – Belgium |
| 0814 | 2068 | nn-NO | Norwegian (Nynorsk) – Norway |
| 0816 | 2070 | pt-PT | Portuguese – Portugal |
| 081A | 2074 | sr-Latn-CS | Serbian (Latin) – Serbia and Montenegro |
| 081D | 2077 | sv-FI | Swedish – Finland |
| 0820 | 2080 | ur-IN | Urdu – (reserved) |
| 082C | 2092 | az-Cyrl-AZ | Azeri (Cyrillic) – Azerbaijan |
| 082E | 2094 | dsb-DE | Lower Sorbian – Germany |
| 0832 | 2098 | tn-BW | Setswana / Tswana – Botswana |
| 083B | 2107 | se-SE | Sami (Northern) – Sweden |
| 083C | 2108 | ga-IE | Irish – Ireland |
| 083E | 2110 | ms-BN | Malay – Brunei Darassalam |
| 0843 | 2115 | uz-Cyrl-UZ | Uzbek (Cyrillic) – Uzbekistan |
| 0845 | 2117 | bn-BD | Bangla – Bangladesh |
| 0846 | 2118 | pa-Arab-PK | Punjabi – Pakistan |
| 0849 | 2121 | ta-LK | Tamil – Sri Lanka |
| 0850 | 2128 | mn-Mong-CN | Mongolian (Mong) – Mongolia |
| 0859 | 2137 | sd-Arab-PK | Sindhi – Pakistan |
| 085D | 2141 | iu-Latn-CA | Inuktitut (Latin) – Canada |
| 085F | 2143 | tzm-Latn-DZ | Tamazight (Latin) – Algeria |
| 0867 | 2151 | ff-Latn-SN | Pular – Senegal |
| 086B | 2155 | quz-EC | Quechua – Ecuador |
| 0873 | 2163 | ti-ER | (reserved) – (reserved) |
| 0873 | 2163 | ti-ER | Tigrinya – Eritrea |
| 0C01 | 3073 | ar-EG | Arabic – Egypt |
| 0C04 | 3076 | zh-HK | Chinese – Hong Kong SAR |
| 0C07 | 3079 | de-AT | German – Austria |
| 0C09 | 3081 | en-AU | English – Australia |
| 0C0A | 3082 | es-ES | Spanish – Spain |
| 0C0C | 3084 | fr-CA | French – Canada |
| 0C1A | 3098 | sr-Cyrl-CS | Serbian (Cyrillic) – Serbia and Montenegro |
| 0C3B | 3131 | se-FI | Sami (Northern) – Finland |
| 0C6B | 3179 | quz-PE | Quechua – Peru |
| 1001 | 4097 | ar-LY | Arabic – Libya |
| 1004 | 4100 | zh-SG | Chinese – Singapore |
| 1007 | 4103 | de-LU | German – Luxembourg |
| 1009 | 4105 | en-CA | English – Canada |
| 100A | 4106 | es-GT | Spanish – Guatemala |
| 100C | 4108 | fr-CH | French – Switzerland |
| 101A | 4122 | hr-BA | Croatian (Latin) – Bosnia and Herzegovina |
| 103B | 4155 | smj-NO | Sami (Lule) – Norway |
| 105F | 4191 | tzm-Tfng-MA | Central Atlas Tamazight (Tifinagh) – Morocco |
| 1401 | 5121 | ar-DZ | Arabic – Algeria |
| 1404 | 5124 | zh-MO | Chinese – Macao SAR |
| 1407 | 5127 | de-LI | German – Liechtenstein |
| 1409 | 5129 | en-NZ | English – New Zealand |
| 140A | 5130 | es-CR | Spanish – Costa Rica |
| 140C | 5132 | fr-LU | French – Luxembourg |
| 141A | 5146 | bs-Latn-BA | Bosnian (Latin) – Bosnia and Herzegovina |
| 143B | 5179 | smj-SE | Sami (Lule) – Sweden |
| 1801 | 6145 | ar-MA | Arabic – Morocco |
| 1809 | 6153 | en-IE | English – Ireland |
| 180A | 6154 | es-PA | Spanish – Panama |
| 180C | 6156 | fr-MC | French – Monaco |
| 181A | 6170 | sr-Latn-BA | Serbian (Latin) – Bosnia and Herzegovina |
| 183B | 6203 | sma-NO | Sami (Southern) – Norway |
| 1C01 | 7169 | ar-TN | Arabic – Tunisia |
| 1c09 | 7177 | en-ZA | English – South Africa |
| 1C0A | 7178 | es-DO | Spanish – Dominican Republic |
| 1C1A | 7194 | sr-Cyrl-BA | Serbian (Cyrillic) – Bosnia and Herzegovina |
| 1C3B | 7227 | sma-SE | Sami (Southern) – Sweden |
| 2001 | 8193 | ar-OM | Arabic – Oman |
| 2009 | 8201 | en-JM | English – Jamaica |
| 200A | 8202 | es-VE | Spanish – Venezuela |
| 201A | 8218 | bs-Cyrl-BA | Bosnian (Cyrillic) – Bosnia and Herzegovina |
| 203B | 8251 | sms-FI | Sami (Skolt) – Finland |
| 2401 | 9217 | ar-YE | Arabic – Yemen |
| 2409 | 9225 | en-029 | English – Caribbean |
| 240A | 9226 | es-CO | Spanish – Colombia |
| 241A | 9242 | sr-Latn-RS | Serbian (Latin) – Serbia |
| 243B | 9275 | smn-FI | Sami (Inari) – Finland |
| 2801 | 10241 | ar-SY | Arabic – Syria |
| 2809 | 10249 | en-BZ | English – Belize |
| 280A | 10250 | es-PE | Spanish – Peru |
| 281A | 10266 | sr-Cyrl-RS | Serbian (Cyrillic) – Serbia |
| 2C01 | 11265 | ar-JO | Arabic – Jordan |
| 2C09 | 11273 | en-TT | English – Trinidad and Tobago |
| 2C0A | 11274 | es-AR | Spanish – Argentina |
| 2C1A | 11290 | sr-Latn-ME | Serbian (Latin) – Montenegro |
| 3001 | 12289 | ar-LB | Arabic – Lebanon |
| 3009 | 12297 | en-ZW | English – Zimbabwe |
| 300A | 12298 | es-EC | Spanish – Ecuador |
| 301A | 12314 | sr-Cyrl-ME | Serbian (Cyrillic) – Montenegro |
| 3401 | 13313 | ar-KW | Arabic – Kuwait |
| 3409 | 13321 | en-PH | English – Philippines |
| 340A | 13322 | es-CL | Spanish – Chile |
| 3801 | 14337 | ar-AE | Arabic – U.A.E. |
| 380A | 14346 | es-UY | Spanish – Uruguay |
| 3C01 | 15361 | ar-BH | Arabic – Bahrain |
| 3C0A | 15370 | es-PY | Spanish – Paraguay |
| 4001 | 16385 | ar-QA | Arabic – Qatar |
| 4009 | 16393 | en-IN | English – India |
| 400A | 16394 | es-BO | Spanish – Bolivia |
| 4409 | 17417 | en-MY | English – Malaysia |
| 440A | 17418 | es-SV | Spanish – El Salvador |
| 4809 | 18441 | en-SG | English – Singapore |
| 480A | 18442 | es-HN | Spanish – Honduras |
| 4C0A | 19466 | es-NI | Spanish – Nicaragua |
| 500A | 20490 | es-PR | Spanish – Puerto Rico |
| 540A | 21514 | es-US | Spanish – United States |
| 7C04 | 31748 | zh-CHT | Chinese – Traditional |
MS Docs regarding the language identifier constants and strings