format PE GUI 4.0 
entry start 

include 'Include\win32a.inc' 

b equ byte 
section '.code' code readable executable 

start: 
        invoke  OpenFile,szFile,FilePE
        mov     [FileHandle],eax
        invoke  ReadFile,FileBuffer,5012,BytesRead
        mov     eax,[BytesRead]
        mov     b[FileBuffer+eax],0
        invoke  MessageBox,0,FileBuffer,szMD,MB_TOPMOST
        invoke  CancelIo,[FileHandle] 

        invoke  ExitProcess,0 

section '.data' data readable writeable 

InternetHandle  dd ?
FileHandle      dd ?
BytesRead       dd ?
FileBuffer      rb 5012
fhandle         dd 0 

FilePE          db 'r',0
szFile          db 'easy.txt',0
szMD          db 'MSGBOX',0

section '.idata' import data readable writeable 

library user32,'USER32.DLL',\ 
          kernel32,'KERNEL32.DLL'

import  kernel32,\
        OpenFile,'OpenFile',\
        ReadFile,'ReadFile',\
        CancelIo,'CancelIo',\
        ExitProcess,'ExitProcess'

import  user32,\
        MessageBox,'MessageBoxA' 
    

HFILE OpenFile(
    LPCSTR lpFileName,    // pointer to filename 
    LPOFSTRUCT lpReOpenBuff, // pointer to buffer for file information  
    UINT uStyle  // action and attributes 
   );