.386
.model flat, stdcall
option casemap :none

include \masm32\include\windows.inc
include \masm32\include\kernel32.inc
include \masm32\include\user32.inc

includelib \masm32\lib\kernel32.lib
includelib \masm32\lib\user32.lib

.data

        HelloWorld db "Hello World!", 0

.code

start:

        invoke MessageBox, NULL, addr HelloWorld, addr HelloWorld, MB_OK
        invoke ExitProcess, 0
        
end start