The following is a list of language and locales supported by Java, and therefore by ExtraView.
| Language | Country | Locale ID |
| Arabic | Saudi Arabia | ar_SA |
| Chinese (Simplified) | China | zh_CN |
| Chinese (Traditional) | Taiwan | zh_TW |
| Dutch | Netherlands | nl_NL |
| English | Australia | en_AU |
| English | Canada | en_CA |
| English | United Kingdom | en_GB |
| English | United States | en_US |
| French | Canada | fr_CA |
| French | France | fr_FR |
| German | Germany | de_DE |
| Hebrew | Israel | iw_IL |
| Hindi | India | hi_IN |
| Italian | Italy | it_IT |
| Japanese | Japan | ja_JP |
| Korean | South Korea | ko_KR |
| Portuguese | Brazil | pt_BR |
| Spanish | Spain | es_ES |
| Swedish | Sweden | sv_SE |
| Thai (Western digits) | Thailand | th_TH |
| Thai (Thai digits) | Thailand | th_TH_TH |
The following list is provided, and believed to work, but is not part of the testing done by Oracle with their Java releases.
| Language | Country | Locale ID |
| Albanian | Albania | sq_AL |
| Arabic | Algeria | ar_DZ |
| Arabic | Bahrain | ar_BH |
| Arabic | Egypt | ar_EG |
| Arabic | Iraq | ar_IQ |
| Arabic | Jordan | ar_JO |
| Arabic | Kuwait | ar_KW |
| Arabic | Lebanon | ar_LB |
| Arabic | Libya | ar_LY |
| Arabic | Morocco | ar_MA |
| Arabic | Oman | ar_OM |
| Arabic | Qatar | ar_QA |
| Arabic | Sudan | |
| Arabic | ar_SD | |
| Arabic | Syria | ar_SY |
| Arabic | Tunisia | ar_TN |
| Arabic | United Arab Emirates | ar_AE |
| Arabic | Yemen | ar_YE |
| Bulgarian | Bulgaria | bg_BG |
| Belorussian | Belorussia | be_BY |
| Catalan | Spain | ca_ES |
| Chinese | Hong Kong | zh_HK |
| Croatian | Croatia | hr_HR |
| Czech | Czech Republic | cs_CZ |
| Danish | Denmark | da_DK |
| Dutch | Belgium | nl_BE |
| English | India | en_IN |
| English | Ireland | en_IE |
| English | New Zealand | en_NZ |
| English | South Africa | en_ZA |
| Estonian | Estonia | et_EE |
| Finnish | Finland | fi_FI |
| French | Belgium | fr_BE |
| French | Luxembourg | fr_LU |
| French | Switzerland | fr_CH |
| German | Austria | de_AT |
| German | Luxembourg | de_LU |
| German | Switzerland | de_CH |
| Greek | Greece | el_GR |
| Hungarian | Hungary | hu_HU |
| Icelandic | Iceland | is_IS |
| Italian | Switzerland | it_CH |
| Latvian | Latvia | lv_LV |
| Lithuanian | Lithuania | lt_LT |
| Macedonian | Macedonia | mk_MK |
| Norwegian (Bokmål) | Norway | no_NO |
| Norwegian (Nynorsk) | Norway | no_NO_NY |
| Polish | Poland | pl_PL |
| Portuguese | Portugal | pt_PT |
| Romanian | Romania | ro_RO |
| Russian | Russia | ru_RU |
| Serbian (Cyrillic) | Yugoslavia | sr_YU |
| Serbo-Croatian | Yugoslavia | sh_YU |
| Slovak | Slovakia | sk_SK |
| Slovenian | Slovenia | sl_SI |
| Spanish | Argentina | es_AR |
| Spanish | Bolivia | es_BO |
| Spanish | Chile | es_CL |
| Spanish | Colombia | es_CO |
| Spanish | Costa Rica | es_CR |
| Spanish | Dominican Republic | es_DO |
| Spanish | Ecuador | es_EC |
| Spanish | El Salvador | es_SV |
| Spanish | Guatemala | es_GT |
| Spanish | Honduras | es_HN |
| Spanish | Mexico | es_MX |
| Spanish | Nicaragua | es_NI |
| Spanish | Panama | es_PA |
| Spanish | Paraguay | es_PY |
| Spanish | Peru | es_PE |
| Spanish | Puerto Rico | es_PR |
| Spanish | Uruguay | es_UY |
| Spanish | Venezuela | es_VE |
| Turkish | Turkey | tr_TR |
| Ukrainian | Ukraine | uk_UA |