To use this module
use Spreadsheet::WriteExcel;

As stated above this module allows you to write excel files
without that annoying popup asking you how your file is
delimeted when you open the file. It works very well,
the only problem i had was trying to convert one of our flat files
that is over 70,000 records in length. But after
i checked the problem is documented, it can only produce files
<~ 7.0 MB. heres on little program I have created with it

#!/usr/bin/perl
use Spreadsheet::WriteExcel;
print "Enter the path to the file(ie /home/): ";
$path = <>;
chomp($path);
print "Enter the filename(ie data): ";
$fname = <>;
chomp($fname);
$file = "$path$fname";
my $workbook = Spreadsheet::WriteExcel->new("/tmp/$fname.xls");
   $worksheet1   = $workbook->addworksheet(sheet1);
   $worksheet2   = $workbook->addworksheet(sheet2);
   $worksheet3   = $workbook->addworksheet(sheet3);
   $format      = $workbook->addformat();
   $format->set_bold();
   $format->set_color('black');
   $format->set_align('center');
   $format->set_size('10');
open input, "$file" || die "Can't open that file";
$k=0;
for (<input>){
chomp($_);
@data = split(/\t/,$_);
for ($i=0; $i<=@data; $i++){
    $worksheet1->write($k, $i, $data[$i], $format);
       }
$k++;
 }
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