Im looking for any Windows Application written in Assembly, just 1 form with 1 button :)

the Assembly compiler WinASM was created in assembly and it's OpenSource

Uh.... compile a program in visual basic and the compiler will translate it to assembly 0.o I think.... :)

MessageBox is a predefined window class, with one or more buttons,
one window, and with a title and text.

Try the Iczelion Win32 Assembly Language Tutorial.

.386
.model flat,stdcall
option casemap:none
include \masm32\include\windows.inc
include \masm32\include\kernel32.inc
includelib \masm32\lib\kernel32.lib
include \masm32\include\user32.inc
includelib \masm32\lib\user32.lib

.data
MsgBoxCaption  db "Hello",0
MsgBoxText       db "Hello World!",0

.code
start:
invoke MessageBox, NULL, addr MsgBoxText, addr MsgBoxCaption, MB_OK
invoke ExitProcess, NULL
end start
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