while rewritting Excel Removes the Comments

My Perl Script is generating excel and updating it daily by extracting contents from server logs, which are writtent o various sheets and colums,
I have used Spreadsheet::Wr iteExcel and Spreadsheet::Pa rseExcel . I am able to comment also, But when the file is saved again with older data,
simply by
Code:
my $workbook;
    {
        local $^W = 0;
...