If you just want to modify a few cells on an existing spreadsheet then consider using Win32::OLE

#!perl
use strict;
use warnings;
use Win32::OLE;
use Win32::OLE::Const 'Microsoft Excel';
$Win32::OLE::Warn = 3; # Die on Errors.

# config
my $dir  = 'c:\\temp\\';
my $file = 'test.xls'; 

my $Excel = Win32::OLE->new('Excel.Application', 'Quit');  
$Excel->{DisplayAlerts} = 0;  
#$Excel->{Visible} = 1;  

my $wb  = $Excel->Workbooks->Open($dir.$file);
my $ws = $wb->sheets(1);

my $cell = $ws->Cells(1,1);
$cell->{Value} = '567';
$cell->Interior->{Color} = rgbLightGreen; 
$cell->Font->{Color}     = rgbDarkGreen; 

$wb->SaveAs($dir.'copy_'.$file);
$wb->Close;
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