The effect of these two lines will be so that when you run the script for the first time, the open(filehandle, filename) || die doesn't die because the file does not exist.
Otherwise, the script would die continuously until you manually created the file. In theory, the ">>" (append) should prevent data from being overwritten in the file if it does exist and you crash with an open filehandle - although that's perhaps not the safest way of doing things.
Try removing these lines, and putting a &CreateFile() unless -e $filename; earlier on in the code instead.
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