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Код

LRESULT WINAPI wndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    static HBITMAP hBmp;

    switch (uMsg)
    {
        case WM_ERASEBKGND:
            {
                RECT rRect;
                GetClientRect(hWnd, &rRect);
                HDC hDC = (HDC)wParam;

                char n[32];
                GetWindowText(hWnd, n, 32);

                SetBkMode(hDC, TRANSPARENT);
                HDC bmpDC = CreateCompatibleDC(hDC);
                SetTextColor(hDC, RGB(255, 255, 255));

                SelectObject(bmpDC, hBmp);
                StretchBlt(hDC, 0, 0, rRect.right, rRect.bottom, bmpDC, 0, 0, 200 /*размеры картинки*/, 400 /*размеры картинки*/, SRCCOPY);

                HFONT hF = (HFONT)SelectObject(hDC, hFont);
                TextOut(hDC, 5, 5, n, lstrlen(n));
                SelectObject(hDC, hF);
                
                DeleteObject(bmpDC);
                ReleaseDC(hWnd, hDC);
                break;
            }
        case WM_CREATE:
            {
                
                HRGN hRgn = CreateRoundRectRgn(0, 0, dwW, r.bottom + 35, 10, 10);
                SetWindowRgn(hWnd, hRgn, TRUE);
                DeleteObject(hRgn);

                hBmp = (HBITMAP)LoadImage(NULL, "d:\\background.bmp", IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);
            }
        case WM_DESTROY:
            {
                DeleteObject(hBmp);
                PostQuitMessage(0);
                break;
            }
        default: return DefWindowProc(hWnd, uMsg, wParam, lParam);
    }
    return 0;
}