[Bug 44392] New: BM_SETIMAGE sets image with white background instead of transparent. Is it possible to set a transparent image on wine ?

https://bugs.winehq.org/show_bug.cgi?id=44392

Bug ID: 44392
           Summary: BM_SETIMAGE sets image with white background instead
                    of transparent. Is it possible to set a transparent
                    image on wine?
           Product: Wine
           Version: unspecified
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: critical
          Priority: P2
         Component: user32
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 60312
  --> https://bugs.winehq.org/attachment.cgi?id=60312
the transparrent image

On windows following code works:
But on wine transparent image(attached png) appears with solid white
background.

The code:

#include <windows.h>
#include <gdiplus.h>
HBITMAP loadBitmap(const wchar_t* path)
{
   HBITMAP tBmp = NULL;
   ULONG_PTR token = 0;
   Gdiplus::GdiplusStartupInput input = NULL;
   Gdiplus::GdiplusStartup(&token, &input, NULL);
   if (token != 0)
   {
      Gdiplus::Bitmap* bmp = new Gdiplus::Bitmap(path);
      bmp->GetHBITMAP(Gdiplus::Color::Transparent, &tBmp);
      delete bmp;
      Gdiplus::GdiplusShutdown(token);
   }
   return tBmp;
}

LRESULT CALLBACK WindowProcedure(HWND hwnd, UINT message, WPARAM wParam, LPARAM
lParam)
{
   static HBITMAP tBmp = NULL;
   switch (message)
   {
   case WM_CREATE:
   {
      HWND btn = CreateWindow(L"BUTTON", L"TEXT", BS_BITMAP | WS_TABSTOP |
WS_VISIBLE | WS_CHILD | BS_DEFPUSHBUTTON,
         100, 100, 95, 25, hwnd, (HMENU)1, NULL, NULL);
      tBmp = loadBitmap(L"C:\zoomin_disabled.png");
      SendMessage(btn, BM_SETIMAGE, IMAGE_BITMAP, (LPARAM)tBmp);
      ShowWindow(btn, SW_SHOW);
   }
   break;
   case WM_DESTROY:
      DeleteObject(tBmp);
      PostQuitMessage(0);
      break;
   default:
      return DefWindowProc(hwnd, message, wParam, lParam);
   }
   return 0;
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE, LPSTR, int)
{

MSG  msg;
   WNDCLASS wc = { 0 };
   wc.lpszClassName = TEXT("EU");
   wc.hInstance = hInstance;
   wc.hbrBackground = GetSysColorBrush(COLOR_3DFACE);
   wc.lpfnWndProc = WindowProcedure;
   wc.hCursor       = LoadCursor(0, IDC_ARROW);
   wc.hIcon = NULL;

RegisterClass(&wc);
   CreateWindow(wc.lpszClassName, TEXT("Express Uninstaller"),
      WS_VISIBLE | WS_CAPTION | WS_SYSMENU | WS_OVERLAPPEDWINDOW | WS_VSCROLL,
      (GetSystemMetrics(SM_CXSCREEN) - 230) / 2, (GetSystemMetrics(SM_CYSCREEN)
- 100 ) / 2, 280 + 10, 110 + 20 + 190, 0, 0, hInstance, 0);

while (GetMessage(&msg, NULL, 0, 0)) {
      TranslateMessage(&msg);
      DispatchMessage(&msg);
   }
}