Is this possible?
On windows using Win32::OLE
#!perl
use strict;
use Win32::OLE 'in';
use Win32::OLE::Const 'Microsoft Excel';
$Win32::OLE::Warn = 3; # Die on Errors.
# config
my $dir = 'c:/temp/';
my $file = 'perl.xlsx';
my $Excel = Win32::OLE->GetActiveObject('Excel.Application')
|| Win32::OLE->new('Excel.Application', 'Quit');
$Excel->{DisplayAlerts} = 0;
#$Excel->{Visible} = 1;
my $Book = $Excel->Workbooks->Open($dir.$file);
my $ws = $Book->Worksheets(1);
for my $c (in $ws->comments) {
print $c->text."\n";
my $str = $c->{'Shape'}->{'TextFrame'}->Characters();
$str->{'Font'}->{'ColorIndex'} = 3; # red
}
# close
$Book->Save;
$Excel->Quit();
undef $Book;
undef $Excel;
poj