WM_DROPFILES not called on x64 - c++

Question

How to make drag & drop? On the win32 machine it works without problems but on the x64 the WM_DROPFILES message is not called at all. Where is the problem?
static LRESULT CALLBACK WindowProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam) {
switch(msg) {
case WM_CREATE: {
SetTimer(hWnd, 0, int(1000./24), NULL);
DragAcceptFiles(hWnd, true);
return 0;
}
case WM_DROPFILES: {
DEBUG;
return 0;
}
case WM_DESTROY:
KillTimer(hWnd, 0);
PostQuitMessage(0);
break;
return DefWindowProc(hWnd, msg, wParam, lParam);
}
return 0;
}
HWND hWnd; WNDCLASSEX wCs;
static const char* wndClassName = "WndClass";
wCs.cbSize = sizeof wCs;
wCs.style = CS_HREDRAW | CS_VREDRAW;
wCs.lpfnWndProc = WindowProc;
wCs.cbClsExtra = 0;
wCs.cbWndExtra = 0;
wCs.hInstance = hInstance;
wCs.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(ID_MYICON));
wCs.hCursor = LoadCursor(NULL, IDC_ARROW);
wCs.hbrBackground = NULL;
wCs.lpszMenuName = NULL;
wCs.lpszClassName = wndClassName;
wCs.hIconSm = LoadIcon(hInstance, MAKEINTRESOURCE(ID_MYICON));
if (RegisterClassEx(&wCs)) {
hWnd = CreateWindowEx(
WS_EX_CLIENTEDGE | WS_EX_ACCEPTFILES, // extended window style
wndClassName, // registered class name
TEXT("APP"), // and window title
WS_OVERLAPPEDWINDOW, // window style
CW_USEDEFAULT, CW_USEDEFAULT, g_winw, g_winh,
NULL, NULL, hInstance, // handle to application instance
this // if need to take pointer
);
SetWindowLongPtr(hWnd, GWLP_USERDATA, (LPARAM)this);
}
if(hWnd==NULL) {
MessageBox(NULL, "Window Creation Failed!", "Error!", MB_ICONEXCLAMATION | MB_OK);
return E_FAIL;
}
if (s_winstate==3)
ShowWindow(hWnd, SW_MAXIMIZE);
else
ShowWindow(hWnd, SW_SHOWNORMAL);
UpdateWindow(hWnd);
mHInstance=hInstance;
hfont = CreateFont(15, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, "Arial");
SendMessage(hWnd, WM_SETFONT, (WPARAM)hfont, TRUE);
I found in another topic from here that drag & drop would be problems with x64 Drag-and-drop from 32 to 64-bit
The difference is that the WM_DROPFILES message doesn't appear to me at all

Answer 1

Adding
ChangeWindowMessageFilter (WM_DROPFILES, MSGFLT_ADD);
ChangeWindowMessageFilter (WM_COPYDATA, MSGFLT_ADD);
ChangeWindowMessageFilter (0x0049, MSGFLT_ADD);
After SendMessage(hWnd, WM_SETFONT, (WPARAM)hfont, TRUE); solve the problem - thanks.