How to convert HWND to IWin32Window? (Why the 64-bit is not available?)

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<span style="color:blue void Message(<span style="color:#2B91AF IWin32Window owner,
<span style="color:blue string Text)
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<span style="color:green // The aim is to convert a HWND to a IWin32Window
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<span> <span style="color:#2B91AF MessageBox.Show(owner, Text);
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<span style="font-size:9.5pt; font-family:Consolas; color:blue void<span style="font-size:9.5pt; font-family:Consolas Test(HWND hWnd)
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Windows::Forms::IWin32Window ^owner = hWnd;
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<span style="color:#8DB3E2 #error <span style="color:gray "error C2440: initializing : cannot convert from HWND to System::Windows::Forms::IWin32Window ^"
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<span style="font-size:9.5pt; font-family:Consolas; color:blue #else
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Windows::Forms::IWin32Window ^owner = *(Windows::Forms::IWin32Window ^ *)&hWnd;
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<span style="color:green // I use Windows 32-bit, but if I will use Windows 64-bit
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<span style="color:green // then (sizeof(hWnd) == 2*sizeof(int)).
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<span style="font-size:9.5pt; font-family:Consolas; color:green <span>
<span> // IWin32Window is always 32-bit i.e. one int, "Can you explain me something?"
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<span style="font-size:9.5pt; font-family:Consolas; color:blue #endif
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WindowsFormsApplication1::Program Program;
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Program.Message(owner, <span style="color:#A31515 "This is a text");
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<span style="color:green // The application crashes! "Can you solve the problem?".
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