rudvil, теперь ошибку линковки выкидует =\\
Linking...
api.obj : error LNK2019: unresolved external symbol "long __stdcall WndProc(struct HWND__ *,unsigned int,unsigned int,long)" (?WndProc@@YGJPAUHWND__@@IIJ@Z) referenced in function _WinMain@16
C:\Documents and Settings\***\Мои документы\Visual Studio 2008\Projects\system\Debug\system.exe : fatal error LNK1120: 1 unresolved externals