diff --git a/include/winnt.h b/include/winnt.h
index 4a5d3bf..654ec46 100644
--- a/include/winnt.h
+++ b/include/winnt.h
@@ -7,6 +7,8 @@
 #ifndef __WINE_WINNT_H
 #define __WINE_WINNT_H
 
+#include "wintypes.h"
+
 /* Heap flags */
 #define HEAP_NO_SERIALIZE               0x00000001
 #define HEAP_GROWABLE                   0x00000002
@@ -21,4 +23,119 @@
 #define HEAP_WINE_SEGPTR                0x01000000  /* Not a Win32 flag */
 #define HEAP_WINE_CODESEG               0x02000000  /* Not a Win32 flag */
 
+/* The Win32 register context */
+
+#define CONTEXT_i386      0x00010000
+#define CONTEXT_i486      CONTEXT_i386
+#define CONTEXT_CONTROL   (CONTEXT_i386 | 0x0001) /* SS:SP, CS:IP, FLAGS, BP */
+#define CONTEXT_INTEGER   (CONTEXT_i386 | 0x0002) /* AX, BX, CX, DX, SI, DI */
+#define CONTEXT_SEGMENTS  (CONTEXT_i386 | 0x0004) /* DS, ES, FS, GS */
+#define CONTEXT_FLOATING_POINT  (CONTEXT_i386 | 0x0008L) /* 387 state */
+#define CONTEXT_DEBUG_REGISTERS (CONTEXT_i386 | 0x0010L) /* DB 0-3,6,7 */
+#define CONTEXT_FULL (CONTEXT_CONTROL | CONTEXT_INTEGER | CONTEXT_SEGMENTS)
+
+#define SIZE_OF_80387_REGISTERS      80
+
+typedef struct
+{
+    DWORD   ControlWord;
+    DWORD   StatusWord;
+    DWORD   TagWord;    
+    DWORD   ErrorOffset;
+    DWORD   ErrorSelector;
+    DWORD   DataOffset;
+    DWORD   DataSelector;    
+    BYTE    RegisterArea[SIZE_OF_80387_REGISTERS];
+    DWORD   Cr0NpxState;
+} FLOATING_SAVE_AREA;
+
+typedef struct
+{
+    DWORD   ContextFlags;
+
+    /* These are selected by CONTEXT_DEBUG_REGISTERS */
+    DWORD   Dr0;
+    DWORD   Dr1;
+    DWORD   Dr2;
+    DWORD   Dr3;
+    DWORD   Dr6;
+    DWORD   Dr7;
+
+    /* These are selected by CONTEXT_FLOATING_POINT */
+    FLOATING_SAVE_AREA FloatSave;
+
+    /* These are selected by CONTEXT_SEGMENTS */
+    DWORD   SegGs;
+    DWORD   SegFs;
+    DWORD   SegEs;
+    DWORD   SegDs;    
+
+    /* These are selected by CONTEXT_INTEGER */
+    DWORD   Edi;
+    DWORD   Esi;
+    DWORD   Ebx;
+    DWORD   Edx;    
+    DWORD   Ecx;
+    DWORD   Eax;
+
+    /* These are selected by CONTEXT_CONTROL */
+    DWORD   Ebp;    
+    DWORD   Eip;
+    DWORD   SegCs;
+    DWORD   EFlags;
+    DWORD   Esp;
+    DWORD   SegSs;
+} CONTEXT, *PCONTEXT;
+
+
+#ifdef __WINE__
+
+/* Macros for easier access to context registers */
+
+#define EAX_reg(context)     ((context)->Eax)
+#define EBX_reg(context)     ((context)->Ebx)
+#define ECX_reg(context)     ((context)->Ecx)
+#define EDX_reg(context)     ((context)->Edx)
+#define ESI_reg(context)     ((context)->Esi)
+#define EDI_reg(context)     ((context)->Edi)
+#define EBP_reg(context)     ((context)->Ebp)
+
+#define CS_reg(context)      ((context)->SegCs)
+#define DS_reg(context)      ((context)->SegDs)
+#define ES_reg(context)      ((context)->SegEs)
+#define FS_reg(context)      ((context)->SegFs)
+#define GS_reg(context)      ((context)->SegGs)
+#define SS_reg(context)      ((context)->SegSs)
+
+#define EFL_reg(context)     ((context)->EFlags)
+#define EIP_reg(context)     ((context)->Eip)
+#define ESP_reg(context)     ((context)->Esp)
+
+#define AX_reg(context)      (*(WORD*)&EAX_reg(context))
+#define BX_reg(context)      (*(WORD*)&EBX_reg(context))
+#define CX_reg(context)      (*(WORD*)&ECX_reg(context))
+#define DX_reg(context)      (*(WORD*)&EDX_reg(context))
+#define SI_reg(context)      (*(WORD*)&ESI_reg(context))
+#define DI_reg(context)      (*(WORD*)&EDI_reg(context))
+#define BP_reg(context)      (*(WORD*)&EBP_reg(context))
+
+#define AL_reg(context)      (*(BYTE*)&EAX_reg(context))
+#define AH_reg(context)      (*((BYTE*)&EAX_reg(context)+1))
+#define BL_reg(context)      (*(BYTE*)&EBX_reg(context))
+#define BH_reg(context)      (*((BYTE*)&EBX_reg(context)+1))
+#define CL_reg(context)      (*(BYTE*)&ECX_reg(context))
+#define CH_reg(context)      (*((BYTE*)&ECX_reg(context)+1))
+#define DL_reg(context)      (*(BYTE*)&EDX_reg(context))
+#define DH_reg(context)      (*((BYTE*)&EDX_reg(context)+1))
+                            
+#define IP_reg(context)      (*(WORD*)&EIP_reg(context))
+#define SP_reg(context)      (*(WORD*)&ESP_reg(context))
+                            
+#define FL_reg(context)      (*(WORD*)&EFL_reg(context))
+
+#define SET_CFLAG(context)   (EFL_reg(context) |= 0x0001)
+#define RESET_CFLAG(context) (EFL_reg(context) &= 0xfffffffe)
+
+#endif  /* __WINE__ */
+
 #endif  /* __WINE_WINNT_H */