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⤷ Detect a wheel of mouse

Use GetSystemMetrics function with SM_MOUSEWHEELPRESENT parameter.
Note: for Windows NT only.

procedure TForm1.Button1Click(Sender: TObject);
  if GetSystemMetrics(SM_MOUSEWHEELPRESENT)<>0 then
    Label1.Caption:='You have a wheel'
    Label1.Caption:='You have not a wheel';
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