C の場合:

ロケール文字列 bcb6(C++Builder6J) bcb10(C++Builder2006J) vc71(VisualStudio.NET2003) vc8(VisualStudio2005)
ja_JP NULL NULL NULL NULL
ja_JP.SJIS NULL NULL NULL NULL
ja_JP.sjis NULL NULL NULL NULL
ja_JP.EUC NULL NULL NULL NULL
ja_JP.eucJP NULL NULL NULL NULL
ja_JP.utf8 NULL NULL NULL NULL
japanese Japanese_Japan.932 Japanese_Japan.932 Japanese_Japan.932 Japanese_Japan.932
japanese_JAPAN Japanese_Japan.932 Japanese_Japan.932 Japanese_Japan.932 Japanese_Japan.932
japanese_JAPAN.932 Japanese_Japan.932 Japanese_Japan.932 Japanese_Japan.932 Japanese_Japan.932
Japanese_Japan.932 Japanese_Japan.932 Japanese_Japan.932 Japanese_Japan.932 Japanese_Japan.932
Japanese_Japan.20932 Japanese_Japan.20932 Japanese_Japan.20932 Japanese_Japan.20932 Japanese_Japan.20932
JAPANESE_JAPAN.JA16SJIS Japanese_Japan.0 Japanese_Japan.0 NULL NULL
japanese_Japan.ja16sjis Japanese_Japan.0 Japanese_Japan.0 NULL NULL
japanese_Japan.ja16euc Japanese_Japan.0 Japanese_Japan.0 NULL NULL
Japanese_Japan.UTF8 Japanese_Japan.0 Japanese_Japan.0 NULL NULL
ja_JP.eucJP NULL NULL NULL NULL
ja_JP.ujis NULL NULL NULL NULL
ja_JP.EUC NULL NULL NULL NULL
japanese.euc Japanese_Japan.0 Japanese_Japan.0 NULL NULL
Japanese-EUC Japanese_Japan.932 Japanese_Japan.932 Japanese_Japan.932 NULL
ja NULL NULL Japanese_Japan.932 NULL
jpn Japanese_Japan.932 Japanese_Japan.932 Japanese_Japan.932 Japanese_Japan.932
japan NULL NULL Japanese_Japan.932 NULL
C-SJIS NULL NULL Catalan_Spain.1252 NULL
de_DE German_Germany.850 German_Germany.850 NULL NULL
de_DE@euro German_Germany.850 German_Germany.850 NULL NULL
de_DE German_Germany.850 German_Germany.850 NULL NULL
de NULL NULL NULL NULL
ge NULL NULL German_Germany.1252 NULL
en_EN NULL NULL NULL NULL
English_USA.1252 NULL NULL English_United States.1252 English_United States.1252
French_France.1252 French_France.1252 French_France.1252 French_France.1252 French_France.1252
French_Canada.ACP French_Canada.0 French_Canada.0 French_Canada.1252 French_Canada.1252
French_Canada.OCP French_Canada.0 French_Canada.0 French_Canada.850 French_Canada.850
de_DE.iso88591 German_Germany.0 German_Germany.0 NULL NULL
de_DE.ISO-8859-1 German_Germany.0 German_Germany.0 NULL NULL
chinese Chinese_Taiwan.950 Chinese_Taiwan.950 Chinese_Taiwan.950 Chinese_Taiwan.950
chinese-simplified Chinese_Taiwan.950 Chinese_Taiwan.950 Chinese_Taiwan.950 Chinese_People's Republic of China.936
chinese-traditional Chinese_Taiwan.950 Chinese_Taiwan.950 Chinese_Taiwan.950 Chinese_Taiwan.950
czech Czech_Czech Republic.852 Czech_Czech Republic.852 Czech_Czech Republic.1250 Czech_Czech Republic.1250
danish Danish_Denmark.850 Danish_Denmark.850 Danish_Denmark.1252 Danish_Denmark.1252
dutch Dutch_Netherlands.850 Dutch_Netherlands.850 Dutch_Netherlands.1252 Dutch_Netherlands.1252
dutch-belgian Dutch_Netherlands.850 Dutch_Netherlands.850 Dutch_Netherlands.1252 Dutch_Belgium.1252
belgian Belarusian_Belarus.866 Belarusian_Belarus.866 Dutch_Belgium.1252 Dutch_Belgium.1252
english English_United States.437 English_United States.437 English_United States.1252 English_United States.1252
english-aus English_United States.437 English_United States.437 English_United States.1252 English_Australia.1252
australian NULL NULL English_Australia.1252 English_Australia.1252
canadian NULL NULL English_Canada.1252 English_Canada.1252
english-can English_United States.437 English_United States.437 English_United States.1252 English_Canada.1252
english-nz English_United States.437 English_United States.437 English_United States.1252 English_New Zealand.1252
english-uk English_United States.437 English_United States.437 English_United States.1252 English_United Kingdom.1252
uk NULL NULL Ukrainian_Ukraine.1251 English_United Kingdom.1252
american NULL NULL English_United States.1252 English_United States.1252
american english English_United States.437 English_United States.437 English_United States.1252 English_United States.1252
american-english English_United States.437 English_United States.437 English_United States.1252 English_United States.1252
english-american English_United States.437 English_United States.437 English_United States.1252 English_United States.1252
english-us English_United States.437 English_United States.437 English_United States.1252 English_United States.1252
english-usa English_United States.437 English_United States.437 English_United States.1252 English_United States.1252
us NULL NULL English_United States.1252 English_United States.1252
finnish Finnish_Finland.850 Finnish_Finland.850 Finnish_Finland.1252 Finnish_Finland.1252
french French_France.850 French_France.850 French_France.1252 French_France.1252
french-belgian French_France.850 French_France.850 French_France.1252 French_Belgium.1252
french-canadian French_France.850 French_France.850 French_France.1252 French_Canada.1252
french-swiss French_France.850 French_France.850 French_France.1252 French_Switzerland.1252
german German_Germany.850 German_Germany.850 German_Germany.1252 German_Germany.1252
german-austrian German_Germany.850 German_Germany.850 German_Germany.1252 German_Austria.1252
swiss NULL NULL German_Switzerland.1252 German_Switzerland.1252
german-swiss German_Germany.850 German_Germany.850 German_Germany.1252 German_Switzerland.1252
greek Greek_Greece.737 Greek_Greece.737 Greek_Greece.1253 Greek_Greece.1253
hungarian Hungarian_Hungary.852 Hungarian_Hungary.852 Hungarian_Hungary.1250 Hungarian_Hungary.1250
icelandic Icelandic_Iceland.850 Icelandic_Iceland.850 Icelandic_Iceland.1252 Icelandic_Iceland.1252
italian Italian_Italy.850 Italian_Italy.850 Italian_Italy.1252 Italian_Italy.1252
italian-swiss Italian_Italy.850 Italian_Italy.850 Italian_Italy.1252 Italian_Switzerland.1252
japanese Japanese_Japan.932 Japanese_Japan.932 Japanese_Japan.932 Japanese_Japan.932
korean Korean_Korea.949 Korean_Korea.949 Korean_Korea.949 Korean_Korea.949
norwegian Norwegian (Bokm虱)_Norway.850 Norwegian (Bokm虱)_Norway.850 Norwegian (Bokm虱)_Norway.1252 Norwegian (Bokm虱)_Norway.1252
norwegian-bokmal Norwegian (Bokm虱)_Norway.850 Norwegian (Bokm虱)_Norway.850 Norwegian (Bokm虱)_Norway.1252 Norwegian (Bokm虱)_Norway.1252
norwegian-nynorsk Norwegian (Bokm虱)_Norway.850 Norwegian (Bokm虱)_Norway.850 Norwegian (Bokm虱)_Norway.1252 Norwegian-Nynorsk_Norway.1252
polish Polish_Poland.852 Polish_Poland.852 Polish_Poland.1250 Polish_Poland.1250
portuguese Portuguese_Brazil.850 Portuguese_Brazil.850 Portuguese_Brazil.1252 Portuguese_Brazil.1252
portuguese-brazilian Portuguese_Brazil.850 Portuguese_Brazil.850 Portuguese_Brazil.1252 Portuguese_Brazil.1252
russian Russian_Russia.866 Russian_Russia.866 Russian_Russia.1251 Russian_Russia.1251
slovak Slovak_Slovakia.852 Slovak_Slovakia.852 Slovak_Slovakia.1250 Slovak_Slovakia.1250
spanish Spanish_Spain.850 Spanish_Spain.850 Spanish_Spain.1252 Spanish_Spain.1252
spanish-mexican Spanish_Spain.850 Spanish_Spain.850 Spanish_Spain.1252 Spanish_Mexico.1252
spanish-modern Spanish_Spain.850 Spanish_Spain.850 Spanish_Spain.1252 Spanish_Spain.1252
swedish Swedish_Sweden.850 Swedish_Sweden.850 Swedish_Sweden.1252 Swedish_Sweden.1252
turkish Turkish_Turkey.857 Turkish_Turkey.857 Turkish_Turkey.1254 Turkish_Turkey.1254
chs NULL NULL Chinese_People's Republic of China.936 Chinese_People's Republic of China.936
cht Chinese_Taiwan.950 Chinese_Taiwan.950 Chinese_Taiwan.950 Chinese_Taiwan.950
csy Czech_Czech Republic.852 Czech_Czech Republic.852 Czech_Czech Republic.1250 Czech_Czech Republic.1250
dan Danish_Denmark.850 Danish_Denmark.850 Danish_Denmark.1252 Danish_Denmark.1252
nld Dutch_Netherlands.850 Dutch_Netherlands.850 Dutch_Netherlands.1252 Dutch_Netherlands.1252
nlb NULL NULL Dutch_Belgium.1252 Dutch_Belgium.1252
ena NULL NULL English_Australia.1252 English_Australia.1252
enc NULL NULL English_Canada.1252 English_Canada.1252
enz NULL NULL English_New Zealand.1252 English_New Zealand.1252
eng NULL NULL English_United Kingdom.1252 English_United Kingdom.1252
enu English_United States.437 English_United States.437 English_United States.1252 English_United States.1252
usa NULL NULL English_United States.1252 English_United States.1252
fin Finnish_Finland.850 Finnish_Finland.850 Finnish_Finland.1252 Finnish_Finland.1252
fra French_France.850 French_France.850 French_France.1252 French_France.1252
frb NULL NULL French_Belgium.1252 French_Belgium.1252
frc NULL NULL French_Canada.1252 French_Canada.1252
frs NULL NULL French_Switzerland.1252 French_Switzerland.1252
deu German_Germany.850 German_Germany.850 German_Germany.1252 German_Germany.1252
dea NULL NULL German_Austria.1252 German_Austria.1252
des NULL NULL German_Switzerland.1252 German_Switzerland.1252
ell Greek_Greece.737 Greek_Greece.737 Greek_Greece.1253 Greek_Greece.1253
hun Hungarian_Hungary.852 Hungarian_Hungary.852 Hungarian_Hungary.1250 Hungarian_Hungary.1250
isl Icelandic_Iceland.850 Icelandic_Iceland.850 Icelandic_Iceland.1252 Icelandic_Iceland.1252
ita Italian_Italy.850 Italian_Italy.850 Italian_Italy.1252 Italian_Italy.1252
its NULL NULL Italian_Switzerland.1252 Italian_Switzerland.1252
kor Korean_Korea.949 Korean_Korea.949 Korean_Korea.949 Korean_Korea.949
nor Norwegian (Bokm虱)_Norway.850 Norwegian (Bokm虱)_Norway.850 Norwegian (Bokm虱)_Norway.1252 Norwegian (Bokm虱)_Norway.1252
non NULL NULL Norwegian-Nynorsk_Norway.1252 Norwegian-Nynorsk_Norway.1252
plk Polish_Poland.852 Polish_Poland.852 Polish_Poland.1250 Polish_Poland.1250
ptg NULL NULL Portuguese_Portugal.1252 Portuguese_Portugal.1252
ptb Portuguese_Brazil.850 Portuguese_Brazil.850 Portuguese_Brazil.1252 Portuguese_Brazil.1252
rus Russian_Russia.866 Russian_Russia.866 Russian_Russia.1251 Russian_Russia.1251
sky Slovak_Slovakia.852 Slovak_Slovakia.852 Slovak_Slovakia.1250 Slovak_Slovakia.1250
esp Spanish_Spain.850 Spanish_Spain.850 Spanish_Spain.1252 Spanish_Spain.1252
esm NULL NULL Spanish_Mexico.1252 Spanish_Mexico.1252
esn NULL NULL Spanish_Spain.1252 Spanish_Spain.1252
sve Swedish_Sweden.850 Swedish_Sweden.850 Swedish_Sweden.1252 Swedish_Sweden.1252
trk Turkish_Turkey.857 Turkish_Turkey.857 Turkish_Turkey.1254 Turkish_Turkey.1254

こうしてみると、処理系ごとや、また同じ処理系でもバージョンによって対応状況が少しずつ違うことがわかります。