ＣＳＶの出力方式を上書き方式に変更したい

ＣＳＶでデータを出力し続けるプログラムを、上書き方式に変更したい

コード
#property strict

input int MaxBars = 1000;//出力したいデータ量を入力(ろうそくの本数)
input string WriteFileName = "Test.csv";     //出力したいファイル名を入力
int handle = INVALID_HANDLE;

int OnInit()
{
    handle = FileOpen(WriteFileName, FILE_CSV | FILE_WRITE | FILE_SHARE_READ, ",");
    if (handle == INVALID_HANDLE) {
        return INIT_FAILED;
    }

    FileWrite(handle, ServerAddress(), Symbol(), Period());
    FileWrite(handle, "DATE", "TIME", "OPEN", "HIGH", "LOW", "CLOSE", "VOLUME");

    return INIT_SUCCEEDED;
}

void OnDeinit(const int)
{
    FileClose(handle);
}

int OnCalculate(const int rates_total,
                const int prev_calculated,
                const datetime &time[],
                const double &open[],
                const double &high[],
                const double &low[],
                const double &close[],
                const long &tick_volume[],
                const long &volume[],
                const int &spread[])
{
    static datetime prevTime = 0;

    datetime currTime = iTime(NULL, PERIOD_CURRENT, 0);

    if(currTime == prevTime) {
        return rates_total;
    }

    prevTime = currTime;

    int limit = Bars - IndicatorCounted() - 1;
    limit = MathMin(limit, MaxBars);

    for(int i = limit; i >= 1; i--) {
        FileWrite(handle, StringFormat("%04d/%02d/%02d", TimeYear(Time[i]), TimeMonth(Time[i]), TimeDay(Time[i])),
                  TimeToString(Time[i], TIME_MINUTES),
                  Open[i],
                  High[i],
                  Low[i],
                  Close[i],
                  Volume[i]);
    }

    FileFlush(handle);

    Comment(WriteFileName + " はMQL4>File フォルダに出力されました。 " + TimeToStr(prevTime, TIME_SECONDS) );

    return(rates_total);
}```