Yes, tried dragging and ctrl+close. Elsewhere advises trying alt if ctrl doesn't work. Others advise using ctrl+File/Exit instead of Close button. etc etc etc. None of those work. Many other 'solutions' don't work, as per my previous post. I see others on the forums advising these methods report that suggestions don't work (though some posters report that they do work, so it ain't consistent).
All this started after I bought a new hard drive, due to mechanical issues with the previous drive. Same Windows installation discs as before, same computer, same make, type and (even!) size of drive. Windows is displaying reduced default window size on window opening and refuses to play any other game. Previous hard drive displayed full window size (using the method -> opening a window within a window, drag the second window to max and close the first. That method isn't working on this new drive).