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procedure TForm1.Button1Click(Sender: TObject);
begin
  Dialog.Execute; //Dialog ist ein TOpenDialog
end;

procedure TForm1.DialogCanClose(Sender: TObject;
  var CanClose: Boolean);
  var puff:String;
begin
  Stream:=TFileStream.Create(Diag.FileName,fmOpenRead or fmShareDenyWrite);
  Stream.Read(puff,Stream.Size);
  Edit1.Text:=puff;
  Edit2.Text:=IntToStr(Stream.Size);
  Stream.Free;
end;                    

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procedure TForm1.Button1Click(Sender: TObject);
begin
  Dialog.Execute; //Dialog ist ein TOpenDialog
end;

procedure TForm1.DialogCanClose(Sender: TObject;
  var CanClose: Boolean);
  var puff:String;
begin
  Stream:=TFileStream.Create(Diag.FileName,fmOpenRead or fmShareDenyWrite);
  
  // Den String so groß wie die Datei machen
  SetLength(puff, Stream.Size);

  // Den gesamten Stream in den String lesen
  Stream.Read(PChar(puff)^, Length(puff));
  
  Edit1.Text:=puff;
  Edit2.Text:=IntToStr(Stream.Size);
  Stream.Free;
end;