Error LNK2028 unresolved token / LNK2019 Unrevolved external symbol

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I'm trying to understand an error when compiling a C++ form project :

Error LNK2028 unresolved token...
Error LNK2019 Unrevolved external symbol ...


Here is how to understand/reproduce my problem with VS2005 :
1- Create a C++ win32 console application with the defaults parameters
2- In the header section add #include <windows.h> and add the
following code in the main() :
HWND hNotepad;
hNotepad = FindWindow(L"Notepad", 0);
3- Compile the console application
-> It compile without any error

4- Now Create a C+ Form application with the default parameters when
creating the new project.
5- In the header section add #include <windows.h> and add the
following code in the main() or somewhere else :
HWND hNotepad;
hNotepad = FindWindow(L"Notepad", 0);

** Now the compiler return errors :

Error error LNK2028: unresolved token (0A00000C) "extern "C" struct
HWND__ * __stdcall FindWindowW(wchar_t const *,wchar_t const *)" (?
FindWindowW@@$$J18YGPAUHWND__@@PB_W0@Z) referenced in function "int
__clrcall main(cli::array<class System::String ^ >^)" (?main@@$$HYMHP
$01AP$AAVString@System@@@Z) AutomationWinForm.obj

Error error LNK2019: unresolved external symbol "extern "C" struct
HWND__ * __stdcall FindWindowW(wchar_t const *,wchar_t const *)" (?
FindWindowW@@$$J18YGPAUHWND__@@PB_W0@Z) referenced in function "int
__clrcall main(cli::array<class System::String ^ >^)" (?main@@$$HYMHP
$01AP$AAVString@System@@@Z) AutomationWinForm.obj
Why?? How can this can be fixed?

Thanks again!

.

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