diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5f2474eaaf8..301855cf326 100755
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -62,9 +62,6 @@ CONFIGURE_FILE(${CMAKE_SOURCE_DIR}/support-files/my-medium.cnf.sh
 CONFIGURE_FILE(${CMAKE_SOURCE_DIR}/support-files/my-small.cnf.sh
                ${CMAKE_SOURCE_DIR}/support-files/my-small.ini @ONLY)
 
-
-ADD_DEFINITIONS(-D__NT__)
-
 IF(CYBOZU)
   ADD_DEFINITIONS(-DCYBOZU)
 ENDIF(CYBOZU)
diff --git a/include/config-win.h b/include/config-win.h
index 514a762d6d8..725b4fdf07b 100644
--- a/include/config-win.h
+++ b/include/config-win.h
@@ -177,7 +177,7 @@ typedef uint rf_SetTimer;
 #define SIZEOF_CHARP		4
 #endif
 #define HAVE_BROKEN_NETINET_INCLUDES
-#ifdef __NT__
+#ifdef _WIN32
 #define HAVE_NAMED_PIPE			/* We can only create pipes on NT */
 #endif
 
@@ -290,11 +290,6 @@ inline ulonglong double2ulonglong(double d)
 #define strcasecmp stricmp
 #define strncasecmp strnicmp
 
-#ifndef __NT__
-#undef FILE_SHARE_DELETE
-#define FILE_SHARE_DELETE 0     /* Not implemented on Win 98/ME */
-#endif
-
 #ifdef NOT_USED
 #define HAVE_SNPRINTF		/* Gave link error */
 #define _snprintf snprintf
@@ -344,7 +339,7 @@ inline ulonglong double2ulonglong(double d)
 #define thread_safe_increment(V,L) InterlockedIncrement((long*) &(V))
 #define thread_safe_decrement(V,L) InterlockedDecrement((long*) &(V))
 /* The following is only used for statistics, so it should be good enough */
-#ifdef __NT__  /* This should also work on Win98 but .. */
+#ifdef _WIN32
 #define thread_safe_add(V,C,L) InterlockedExchangeAdd((long*) &(V),(C))
 #define thread_safe_sub(V,C,L) InterlockedExchangeAdd((long*) &(V),-(long) (C))
 #endif
diff --git a/include/my_sys.h b/include/my_sys.h
index 451c8418ebd..4b93dc0e364 100644
--- a/include/my_sys.h
+++ b/include/my_sys.h
@@ -640,7 +640,7 @@ extern int      my_access(const char *path, int amode);
 extern int check_if_legal_filename(const char *path);
 extern int check_if_legal_tablename(const char *path);
 
-#if defined(__WIN__) && defined(__NT__)
+#ifdef _WIN32
 extern int nt_share_delete(const char *name,myf MyFlags);
 #define my_delete_allow_opened(fname,flags)  nt_share_delete((fname),(flags))
 #else
diff --git a/mysys/my_delete.c b/mysys/my_delete.c
index 22425ed95fd..3ab6ba399f9 100644
--- a/mysys/my_delete.c
+++ b/mysys/my_delete.c
@@ -36,7 +36,7 @@ int my_delete(const char *name, myf MyFlags)
   DBUG_RETURN(err);
 } /* my_delete */
 
-#if defined(__WIN__) && defined(__NT__)
+#if defined(__WIN__)
 /*
   Delete file which is possibly not closed.
 
diff --git a/mysys/my_thr_init.c b/mysys/my_thr_init.c
index c59b2d51742..c6057f19a82 100644
--- a/mysys/my_thr_init.c
+++ b/mysys/my_thr_init.c
@@ -267,6 +267,11 @@ my_bool my_thread_init(void)
 #endif    
     goto end;
   }
+
+#ifdef _MSC_VER
+  install_sigabrt_handler();
+#endif
+
   if (!(tmp= (struct st_my_thread_var *) calloc(1, sizeof(*tmp))))
   {
     error= 1;
diff --git a/mysys/my_winfile.c b/mysys/my_winfile.c
index de1d747c967..6a2cda5ba29 100644
--- a/mysys/my_winfile.c
+++ b/mysys/my_winfile.c
@@ -314,10 +314,10 @@ size_t my_win_pread(File Filedes, uchar *Buffer, size_t Count, my_off_t offset)
   if(!ReadFile(hFile, Buffer, (DWORD)Count, &nBytesRead, &ov))
   {
     DWORD lastError= GetLastError();
-    /*
-      ERROR_BROKEN_PIPE is returned when no more data coming
-      through e.g. a command pipe in windows : see MSDN on ReadFile.
-    */
+    /*
+      ERROR_BROKEN_PIPE is returned when no more data coming
+      through e.g. a command pipe in windows : see MSDN on ReadFile.
+    */
     if(lastError == ERROR_HANDLE_EOF || lastError == ERROR_BROKEN_PIPE)
       DBUG_RETURN(0); /*return 0 at EOF*/
     my_osmaperr(lastError);
@@ -367,8 +367,8 @@ size_t my_win_pwrite(File Filedes, const uchar *Buffer, size_t Count,
   LARGE_INTEGER li;
 
   DBUG_ENTER("my_win_pwrite");
-  DBUG_PRINT("my",("Filedes: %d, Buffer: %p, Count: %zd, offset: %llu", 
-    Filedes, Buffer, Count, (ulonglong)offset));
+  DBUG_PRINT("my",("Filedes: %d, Buffer: %p, Count: %llu, offset: %llu", 
+    Filedes, Buffer, (ulonglong)Count, (ulonglong)offset));
 
   if(!Count)
     DBUG_RETURN(0);
@@ -425,7 +425,8 @@ size_t my_win_write(File fd, const uchar *Buffer, size_t Count)
   HANDLE hFile;
 
   DBUG_ENTER("my_win_write");
-  DBUG_PRINT("my",("Filedes: %d, Buffer: %p, Count %zd", fd, Buffer, Count));
+  DBUG_PRINT("my",("Filedes: %d, Buffer: %p, Count %llu", fd, Buffer, 
+      (ulonglong)Count));
   if(my_get_open_flags(fd) & _O_APPEND)
   {
     /*
diff --git a/sql/log.cc b/sql/log.cc
index 3d4aca572f0..ed208a84ffc 100644
--- a/sql/log.cc
+++ b/sql/log.cc
@@ -33,7 +33,7 @@
 #include <stdarg.h>
 #include <m_ctype.h>				// For test_if_number
 
-#ifdef __NT__
+#ifdef _WIN32
 #include "message.h"
 #endif
 
@@ -1794,7 +1794,7 @@ File open_binlog(IO_CACHE *log, const char *log_file_name, const char **errmsg)
   DBUG_RETURN(-1);
 }
 
-#ifdef __NT__
+#ifdef _WIN32
 static int eventSource = 0;
 
 static void setup_windows_event_source()
@@ -1829,7 +1829,7 @@ static void setup_windows_event_source()
   RegCloseKey(hRegKey);
 }
 
-#endif /* __NT__ */
+#endif /* _WIN32 */
 
 
 /**
@@ -1960,7 +1960,7 @@ bool MYSQL_LOG::open(const char *log_name, enum_log_type log_type_arg,
 #ifdef EMBEDDED_LIBRARY
                         "embedded library\n",
                         my_progname, server_version, MYSQL_COMPILATION_COMMENT
-#elif __NT__
+#elif _WIN32
 			"started with:\nTCP Port: %d, Named Pipe: %s\n",
                         my_progname, server_version, MYSQL_COMPILATION_COMMENT,
                         mysqld_port, mysqld_unix_port
@@ -4851,7 +4851,7 @@ void MYSQL_BIN_LOG::signal_update()
   DBUG_VOID_RETURN;
 }
 
-#ifdef __NT__
+#ifdef _WIN32
 static void print_buffer_to_nt_eventlog(enum loglevel level, char *buff,
                                         size_t length, size_t buffLen)
 {
@@ -4884,7 +4884,7 @@ static void print_buffer_to_nt_eventlog(enum loglevel level, char *buff,
 
   DBUG_VOID_RETURN;
 }
-#endif /* __NT__ */
+#endif /* _WIN32 */
 
 
 /**
@@ -4946,7 +4946,7 @@ int vprint_msg_to_log(enum loglevel level, const char *format, va_list args)
   length= my_vsnprintf(buff, sizeof(buff), format, args);
   print_buffer_to_file(level, buff);
 
-#ifdef __NT__
+#ifdef _WIN32
   print_buffer_to_nt_eventlog(level, buff, length, sizeof(buff));
 #endif
 
diff --git a/sql/mysqld.cc b/sql/mysqld.cc
index 3585539318d..e2d4de4dc56 100644
--- a/sql/mysqld.cc
+++ b/sql/mysqld.cc
@@ -732,7 +732,7 @@ static	 NTService  Service;	      ///< Service object for WinNT
 #endif /* EMBEDDED_LIBRARY */
 #endif /* __WIN__ */
 
-#ifdef __NT__
+#ifdef _WIN32
 static char pipe_name[512];
 static SECURITY_ATTRIBUTES saPipeSecurity;
 static SECURITY_DESCRIPTOR sdPipeDescriptor;
@@ -812,7 +812,7 @@ pthread_handler_t handle_connections_sockets_thread(void *arg);
 pthread_handler_t kill_server_thread(void *arg);
 static void bootstrap(FILE *file);
 static bool read_init_file(char *file_name);
-#ifdef __NT__
+#ifdef _WIN32
 pthread_handler_t handle_connections_namedpipes(void *arg);
 #endif
 #ifdef HAVE_SMEM
@@ -898,7 +898,7 @@ static void close_connections(void)
       ip_sock= INVALID_SOCKET;
     }
   }
-#ifdef __NT__
+#ifdef _WIN32
   if (hPipe != INVALID_HANDLE_VALUE && opt_enable_named_pipe)
   {
     HANDLE temp;
@@ -1690,7 +1690,7 @@ static void network_init(void)
     }
   }
 
-#ifdef __NT__
+#ifdef _WIN32
   /* create named pipe */
   if (Service.IsNT() && mysqld_unix_port[0] && !opt_bootstrap &&
       opt_enable_named_pipe)
@@ -4124,12 +4124,11 @@ static void create_shutdown_thread()
 #endif /* EMBEDDED_LIBRARY */
 
 
-#if (defined(__NT__) || defined(HAVE_SMEM)) && !defined(EMBEDDED_LIBRARY)
+#if (defined(_WIN32) || defined(HAVE_SMEM)) && !defined(EMBEDDED_LIBRARY)
 static void handle_connections_methods()
 {
   pthread_t hThread;
   DBUG_ENTER("handle_connections_methods");
-#ifdef __NT__
   if (hPipe == INVALID_HANDLE_VALUE &&
       (!have_tcpip || opt_disable_networking) &&
       !opt_enable_shared_memory)
@@ -4137,12 +4136,10 @@ static void handle_connections_methods()
     sql_print_error("TCP/IP, --shared-memory, or --named-pipe should be configured on NT OS");
     unireg_abort(1);				// Will not return
   }
-#endif
 
   pthread_mutex_lock(&LOCK_thread_count);
   (void) pthread_cond_init(&COND_handler_count,NULL);
   handler_count=0;
-#ifdef __NT__
   if (hPipe != INVALID_HANDLE_VALUE)
   {
     handler_count++;
@@ -4153,7 +4150,6 @@ static void handle_connections_methods()
       handler_count--;
     }
   }
-#endif /* __NT__ */
   if (have_tcpip && !opt_disable_networking)
   {
     handler_count++;
@@ -4193,7 +4189,7 @@ void decrement_handler_count()
 }
 #else
 #define decrement_handler_count()
-#endif /* defined(__NT__) || defined(HAVE_SMEM) */
+#endif /* defined(_WIN32) || defined(HAVE_SMEM) */
 
 
 #ifndef EMBEDDED_LIBRARY
@@ -5261,7 +5257,7 @@ pthread_handler_t handle_connections_namedpipes(void *arg)
   decrement_handler_count();
   DBUG_RETURN(0);
 }
-#endif /* __NT__ */
+#endif /* _WIN32 */
 
 
 #ifdef HAVE_SMEM
@@ -5837,7 +5833,7 @@ struct my_option my_long_options[] =
    "Deprecated option, use --external-locking instead.",
    (uchar**) &opt_external_locking, (uchar**) &opt_external_locking,
    0, GET_BOOL, NO_ARG, 0, 0, 0, 0, 0, 0},
-#ifdef __NT__
+#ifdef _WIN32
   {"enable-named-pipe", OPT_HAVE_NAMED_PIPE, "Enable the named pipe (NT).",
    (uchar**) &opt_enable_named_pipe, (uchar**) &opt_enable_named_pipe, 0, GET_BOOL,
    NO_ARG, 0, 0, 0, 0, 0, 0},
diff --git a/sql/set_var.cc b/sql/set_var.cc
index dc966c306a5..2e2bb369af1 100644
--- a/sql/set_var.cc
+++ b/sql/set_var.cc
@@ -434,7 +434,7 @@ static sys_var_thd_enum         sys_myisam_stats_method(&vars, "myisam_stats_met
                                                 &myisam_stats_method_typelib,
                                                 NULL);
 
-#ifdef __NT__
+#ifdef _WIN32
 /* purecov: begin inspected */
 static sys_var_const            sys_named_pipe(&vars, "named_pipe",
                                                OPT_GLOBAL, SHOW_MY_BOOL,
diff --git a/sql/sql_connect.cc b/sql/sql_connect.cc
index a87d201d9ed..4ae267a880c 100644
--- a/sql/sql_connect.cc
+++ b/sql/sql_connect.cc
@@ -949,7 +949,7 @@ static bool login_connection(THD *thd)
 
   if (error)
   {						// Wrong permissions
-#ifdef __NT__
+#ifdef _WIN32
     if (vio_type(net->vio) == VIO_TYPE_NAMEDPIPE)
       my_sleep(1000);				/* must wait after eof() */
 #endif
diff --git a/vio/viosocket.c b/vio/viosocket.c
index 2d7fd0e08cd..2a22f8c7c15 100644
--- a/vio/viosocket.c
+++ b/vio/viosocket.c
@@ -264,7 +264,7 @@ int vio_close(Vio * vio)
 #ifdef __WIN__
   if (vio->type == VIO_TYPE_NAMEDPIPE)
   {
-#if defined(__NT__) && defined(MYSQL_SERVER)
+#if defined(MYSQL_SERVER)
     CancelIo(vio->hPipe);
     DisconnectNamedPipe(vio->hPipe);
 #endif
@@ -450,7 +450,7 @@ int vio_close_pipe(Vio * vio)
 {
   int r;
   DBUG_ENTER("vio_close_pipe");
-#if defined(__NT__) && defined(MYSQL_SERVER)
+#if defined(MYSQL_SERVER)
   CancelIo(vio->hPipe);
   DisconnectNamedPipe(vio->hPipe);
 #endif