сборка

@echo off
set path=\masm32\bin
set lib=\masm32\lib
set name=SOFT
ml.exe /c /coff "%name%".asm
link.exe /SUBSYSTEM:WINDOWS /opt:nowin98 /LIBPATH:"%lib%" "%name%".obj
del *.OBJ
pause
@echo on
cls
...................................................
.386
.model flat, stdcall
option casemap :none   ; case sensitive

; ---- Include ------------------------------------------------------------
include \masm32\include\windows.inc
include \masm32\include\user32.inc
include \masm32\include\kernel32.inc
include \masm32\include\ntdll.inc
include \masm32\include\shell32.inc
include \masm32\macros\macros.asm

includelib \masm32\lib\shell32.lib
includelib \masm32\lib\user32.lib
includelib \masm32\lib\kernel32.lib
includelib \masm32\lib\ntdll.lib

; ---- Initialized data ---------------------------------------------------
.data
errorm db "error",0
message db "msg",0;переменная с сообщением
msgtitle db "TITLE",0 ;переменная с заголовком
.data?
buffer db 128 dup(?)

; ---- Code ---------------------------------------------------------------
.code
start:
mov eax,[offset message+3]
cmp BYTE PTR DS:[EAX],00h
jnz err
invoke MessageBox,0,offset message,offset msgtitle,MB_OK ;выводим сообщение
jmp finish
err:invoke MessageBox,0,offset errorm,offset errorm,MB_OK ;выводим сообщение
finish:
    invoke ExitProcess,0
end start