https://bugs.winehq.org/show_bug.cgi?id=13683
--- Comment #42 from Christopher Thielen cthielen@gmail.com --- Using API Monitor, it appears u9.exe is calling SetCapture which ends up calling DDRAW.DLL's DDGetAttachedSurfaceLd which is calling d3d9.dll's CheckFullscreen which is sending WM_CAPTURECHANGED to u9.exe referencing u9.exe's hWnd and setting lParam to the exact same value. In this case it's 0x000d0102 but that's surely specific to my instance of Windows.