The method of letting the Win7 system drag the window is no longer transparent.

  
As long as you need to right-click [Computer] - [Properties] in the Windows 7 system start menu, select [Advanced System Settings] - [Advanced] - A [Settings] - [Visual Effects] tab - [Show window contents while dragging] Tick
Click [OK] and drag the window again to find that the window is opaque.

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