$ cat a.pl
use XML::Twig;
my $gPFile = 'test.xml';
open (TMP,">".$gPFile.".pp") or die;;
my $ppml_twig = new XML::Twig(keep_encoding => 1);
$ppml_twig->parsefile($gPFile);
$ppml_twig->set_pretty_print('indented');
$ppml_twig->print( \*TMP);;
close(TMP);
$ perl -pe'use open ":std", ":locale"; BEGIN { binmode STDIN, ":raw:encoding(Windows-1252)" }' test.xml
foo
bar
é
$ perl a.pl
$ perl -pe'use open ":std", ":locale"; BEGIN { binmode STDIN, ":raw:encoding(Windows-1252)" }' test.xml.pp
foo
bar
é