これがないと実機ではエラーがでる

FileMode := fmOpenRead ;

procedure THistoricalList.saveBinary(aFileName: String);

var
  i: integer;

  F: file of TOHLCRecord;
  tmpOHLCRecord: TOHLCRecord;
begin

  AssignFile(F, aFileName);
  ReWrite(F);

  // ファイルのヘッダー情報を open に書き込む
  tmpOHLCRecord.high  := 0;
  tmpOHLCRecord.low   := 0;
  tmpOHLCRecord.close := 0;
  // 0  THIS_PROGRAM_VERSION
  tmpOHLCRecord.open := THIS_PROGRAM_VERSION;
  Write(F, tmpOHLCRecord);
  // 1  Pair
  tmpOHLCRecord.open := Self.Pair.serial;
  Write(F, tmpOHLCRecord);
  // 2  timeStep
  tmpOHLCRecord.open := timeStep.serial;
  Write(F, tmpOHLCRecord);
  // 3  IsConsecutiveData
  tmpOHLCRecord.open := StrToInt(BoolToStr(Self.IsConsecutiveData));
  Write(F, tmpOHLCRecord);
  // 4  Count
  tmpOHLCRecord.open := Self.Count;
  Write(F, tmpOHLCRecord);

  for i := 5 to BINARYHEADER_COUNT - 1 do
  begin
    tmpOHLCRecord.open := -1;
    Write(F, tmpOHLCRecord);
  end;

  for i := 0 to self.Count - 1 do
  begin
    tmpOHLCRecord.IDateTimeValue := self.Items[i].IDateTime.Value;
    tmpOHLCRecord.open  := self.Items[i].PipOpen;
    tmpOHLCRecord.high  := self.Items[i].PipHigh;
    tmpOHLCRecord.low   := self.Items[i].PipLow;
    tmpOHLCRecord.close := self.Items[i].PipClose;
    Write(F, tmpOHLCRecord);
  end;

  CloseFile(F);
end;

procedure THistoricalList.loadBinary(aFileName: String);
var
  i: integer;

  F: file of TOHLCRecord;
  tmpOHLCRecord: TOHLCRecord;
  counter: Integer;
  tmpRecord: THistoricalRecord;

  tmpStartDateTimeValue: Integer;
  tmpEndDateTimeValue: Integer;
  tmpIsConsecutiveData: Boolean;
  tmpCounter: Integer;
begin

  AssignFile(F, aFileName);
  FileMode := fmOpenRead ;  //   
  Reset(F);

//  if tmpFlag then ShowMessage('Exists') else ShowMessage('NOT Exists');

  // 0  THIS_PROGRAM_VERSION
  Read(F, tmpOHLCRecord);
  // 1  Pair
  Read(F, tmpOHLCRecord);
  Self.pair.serial := tmpOHLCRecord.open;
  // 2  timeStep
  Read(F, tmpOHLCRecord);
  Self.TimeStep.serial := tmpOHLCRecord.open;
  // 3  IsConsecutiveData
  Read(F, tmpOHLCRecord);
  tmpIsConsecutiveData   := StrToBool(IntToStr(tmpOHLCRecord.open));
  // 4  Count
  Read(F, tmpOHLCRecord);
  tmpCounter := tmpOHLCRecord.open;

  // 空読み
  for i := 5 to BINARYHEADER_COUNT - 1 do
    Read(F, tmpOHLCRecord);

  SetLength(Self.Items, tmpCounter);

  for i := 0 to tmpCounter - 1 do
  begin
    Read(F, tmpOHLCRecord);
    tmpRecord.IDateTime.Value := tmpOHLCRecord.IDateTimeValue;
    tmpRecord.PipOpen  := tmpOHLCRecord.open;
    tmpRecord.PipHigh  := tmpOHLCRecord.high;
    tmpRecord.PipLow   := tmpOHLCRecord.low;
    tmpRecord.PipClose := tmpOHLCRecord.close;

    Self.Items[i].Assign(tmpRecord);
  end;

  CloseFile(F);

end;