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procedure TForm1.Button9Click(Sender: TObject);
begin
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procedure TForm1.Button9Click(Sender: TObject);
begin
button9.Caption := ChangeFileExt('ÎÒµÄaÎļþ.txt','');
end;
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interface
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type
TDemoForm = class(TForm)
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Label2: TLabel;
Label3: TLabel;
Label4: TLabel;
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CloseButton: TBitBtn;
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