// Question: 
// How can I read the default language of installed MS Word application? 

// Answer: 
// You may initialize Word.Application instance and read a CountryID: 

var
 word: OLEVariant;
 begin
 word := CreateOLEObject('Word.Application');
 CountryID := word.System.Country;
 word.Quit;
 word := UnAssigned;
 end;

 // After that check this CountryID with next values: 
 wdUS = $00000001;
 wdCanada = $00000002;
 wdLatinAmerica = $00000003;
 wdNetherlands = $0000001F;
 wdFrance = $00000021;
 wdSpain = $00000022;
 wdItaly = $00000027;
 wdUK = $0000002C;
 wdDenmark = $0000002D;
 wdSweden = $0000002E;
 wdNorway = $0000002F;
 wdGermany = $00000031;
 wdPeru = $00000033;
 wdMexico = $00000034;
 wdArgentina = $00000036;
 wdBrazil = $00000037;
 wdChile = $00000038;
 wdVenezuela = $0000003A;
 wdJapan = $00000051;
 wdTaiwan = $00000376;
 wdChina = $00000056;
 wdKorea = $00000052;
 wdFinland = $00000166;
 wdIceland = $00000162;