diff --git a/SDK/INC/NT/ntdef.h b/SDK/INC/NT/ntdef.h
index 0e1032a..97165c7 100644
--- a/SDK/INC/NT/ntdef.h
+++ b/SDK/INC/NT/ntdef.h
@@ -97,35 +97,6 @@ typedef unsigned long ULONG;
 #define MAXUSHORT 0xffff
 #define MAXULONG  0xffffffff
 
-//
-// Basic pointer types.
-//
-typedef VOID *PVOID;
-typedef CHAR *PCHAR;
-typedef SHORT *PSHORT;
-typedef UCHAR *PUCHAR;
-typedef USHORT *PUSHORT;
-typedef ULONG *PULONG;
-
-//
-// Handle types.
-//
-typedef PVOID HANDLE;
-typedef HANDLE *PHANDLE;
-
-//
-// String types.
-//
-typedef CHAR *PSTR, *LPSTR;
-typedef CONST CHAR *PCSTR, *LPCSTR;
-
-//
-// Wide character/string types.
-//
-typedef USHORT WCHAR;
-typedef WCHAR *PWCHAR, *PWSTR, *LPWSTR;
-typedef CONST WCHAR *PCWSTR, *LPCWSTR;
-
 //
 // Long long types.
 //
@@ -145,12 +116,6 @@ typedef ULONGLONG *PULONGLONG;
 
 #define MAXLONGLONG  (0x7fffffffffffffff)
 
-#ifdef _WIN64
-typedef ULONGLONG ULONG_PTR;
-#else
-typedef ULONG ULONG_PTR;
-#endif
-
 //
 // Logical/boolean value types.
 //
@@ -164,6 +129,48 @@ typedef BOOLEAN *PBOOLEAN;
 #define TRUE  1
 #define FALSE 0
 
+//
+// Basic pointer types.
+//
+typedef VOID *PVOID;
+typedef CHAR *PCHAR;
+typedef SHORT *PSHORT;
+typedef UCHAR *PUCHAR;
+typedef USHORT *PUSHORT;
+typedef ULONG *PULONG;
+
+//
+// Numeric pointer types.
+//
+#ifdef _WIN64
+typedef LONGLONG LONG_PTR;
+typedef ULONGLONG ULONG_PTR;
+#else
+typedef LONG LONG_PTR;
+typedef ULONG ULONG_PTR;
+#endif
+
+//
+// String types.
+//
+typedef CHAR *PSTR, *LPSTR;
+typedef CONST CHAR *PCSTR, *LPCSTR;
+
+//
+// Wide character/string types.
+//
+typedef USHORT WCHAR;
+typedef WCHAR *PWCHAR, *PWSTR, *LPWSTR;
+typedef CONST WCHAR *PCWSTR, *LPCWSTR;
+
+//
+// Handle types.
+//
+typedef PVOID HANDLE;
+typedef HANDLE *PHANDLE;
+
+#define INVALID_HANDLE_VALUE ((HANDLE)(LONG_PTR)-1)
+
 //
 // Status code types.
 //