different MSG boxes under XP

Hi,

compile first this code, under name: lok_dll.dll

Code:

format PE GUI 4.0 DLL
include '%fasminc%/win32a.inc'
section '.data' data readable writeable
check   dd    0
napis db "\\.\mailslot\olal",0

entry   EntryDLL

section '.code'     code readable executable

proc    EntryDLL    ,a,b,c
        enter
        sub esp     ,100

        mov [esp]   ,dword 'info'
        mov [esp+4] ,dword '-loa'
        mov [esp+8] ,dword 'ded!'
        mov [esp+12],dword 0
invoke CreateMailslot,napis,0,0,0
        cmp eax,-1
        jne dalej
        mov [esp+4] ,dword '-Fre'
        mov [esp+8] ,dword 'e!!!'
        mov [esp+12],dword 0
        inc [check]
dalej:
        lea eax     ,[esp]
invoke  MessageBox  ,0,eax,eax,0
        leave
        ret
endp



proc    alex,z
        enter
        return
endp

section '.idata'    import data readable writeable

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

import  user32,\
        MessageBox, 'MessageBoxA'

import  kernel,\
        ExitProcess,'ExitProcess',\
        CreateMailslot,'CreateMailslotA'
section '.edata' export data readable

export  'lok_dll.dll',\
        alex,'alex'
section '.reloc' fixups data discardable

and then in the same directory plesae compile&run:

Code:

include '%fasminc%\win32ax.inc'
.code
start:
invoke LoadLibrary,"lok_dll.dll"
invoke ExitProcess,0
.end start

I dedicated the program to show when the system calls the dllentrypoint.
The result is the msgbox when library is loaded and the second one when is unloaded. The strange thing is the msgbox appearance.

why the both msgboxes have different frames?

regards,
h