diff --git a/reactos/include/winnt.h b/reactos/include/winnt.h
index 7e520581377..3cfe5d25645 100644
--- a/reactos/include/winnt.h
+++ b/reactos/include/winnt.h
@@ -730,6 +730,8 @@ typedef enum
 #define SUBLANG_CHINESE_HONGKONG	0x03
 #define SUBLANG_CHINESE_SINGAPORE	0x04
 #define SUBLANG_CHINESE_MACAU	0x05
+#define SUBLANG_CZECH_CZECH_REPUBLIC 0x1
+#define SUBLANG_DANISH_DENMARK 0x1
 #define SUBLANG_DUTCH	0x01
 #define SUBLANG_DUTCH_BELGIAN	0x02
 #define SUBLANG_ENGLISH_US	0x01
@@ -745,6 +747,7 @@ typedef enum
 #define SUBLANG_ENGLISH_TRINIDAD	0x0b
 #define SUBLANG_ENGLISH_ZIMBABWE	0x0c
 #define SUBLANG_ENGLISH_PHILIPPINES	0x0d
+#define SUBLANG_FINNISH_FINLAND 0x1
 #define SUBLANG_FRENCH	0x01
 #define SUBLANG_FRENCH_BELGIAN	0x02
 #define SUBLANG_FRENCH_CANADIAN	0x03
@@ -756,8 +759,11 @@ typedef enum
 #define SUBLANG_GERMAN_AUSTRIAN	0x03
 #define SUBLANG_GERMAN_LUXEMBOURG	0x04
 #define SUBLANG_GERMAN_LIECHTENSTEIN	0x05
+#define SUBLANG_GREEK_GREECE 0x1
+#define SUBLANG_HUNGARIAN_HUNGARY 0x1
 #define SUBLANG_ITALIAN	0x01
 #define SUBLANG_ITALIAN_SWISS	0x02
+#define SUBLANG_JAPANESE_JAPAN 0x1
 #define SUBLANG_KASHMIRI_INDIA	0x02
 #define SUBLANG_KASHMIRI_SASIA	0x02
 #define SUBLANG_KOREAN	0x01
@@ -767,10 +773,15 @@ typedef enum
 #define SUBLANG_NEPALI_INDIA	0x02
 #define SUBLANG_NORWEGIAN_BOKMAL	0x01
 #define SUBLANG_NORWEGIAN_NYNORSK	0x02
+#define SUBLANG_POLISH_POLAND 0x1
 #define SUBLANG_PORTUGUESE	0x01
 #define SUBLANG_PORTUGUESE_BRAZILIAN	0x02
+#define SUBLANG_ROMANIAN_ROMANIA 0x1
+#define SUBLANG_RUSSIAN_RUSSIA 0x1
 #define SUBLANG_SERBIAN_LATIN	0x02
 #define SUBLANG_SERBIAN_CYRILLIC	0x03
+#define SUBLANG_SLOVAK_SLOVAKIA 0x1
+#define SUBLANG_SLOVENIAN_SLOVENIA 0x1
 #define SUBLANG_SPANISH	0x01
 #define SUBLANG_SPANISH_MEXICAN	0x02
 #define SUBLANG_SPANISH_MODERN	0x03
@@ -793,8 +804,10 @@ typedef enum
 #define SUBLANG_SPANISH_PUERTO_RICO	0x14
 #define SUBLANG_SWEDISH	0x01
 #define SUBLANG_SWEDISH_FINLAND	0x02
+#define SUBLANG_THAI_THAILAND 0x1
 #define SUBLANG_URDU_PAKISTAN	0x01
 #define SUBLANG_URDU_INDIA	0x02
+#define SUBLANG_UKRAINIAN_UKRAINE 0x1
 #define SUBLANG_UZBEK_LATIN	0x01
 #define SUBLANG_UZBEK_CYRILLIC	0x02
 #define NLS_VALID_LOCALE_MASK	1048575