My question is regarding Spreadsheet::WriteExcel or any other module that writes to Excel. All the code documentation I have found always start with : 
my $s = Excel->new("here.xls");

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Which creates a new spreadsheet, does this also open an existing spreasheet to modify? I created an excel template and need to open the existing file and modify it each time I run the script. I tried it but I didnt work and wrote over my existing. Thanks everyone.

In reply to write over existing Excel file by Anonymous Monk

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