Details
Description
from: platforms/windows/qwindowscontext.cpp
QWindowsUser32DLL::init()
{
...
updateLayeredWindowIndirect = (UpdateLayeredWindowIndirect)(library.resolve("UpdateLayeredWindowIndirect"));
Q_ASSERT(setLayeredWindowAttributes && updateLayeredWindow
&& updateLayeredWindowIndirect);
As Windows XP does not have the api UpdateLayeredWindowIndirect, so the assert will fail.