#!/usr/bin/perl

use strict;
use warnings;

use Win32::OLE;
use Win32::OLE::Const 'Microsoft Word';
$Win32::OLE::Warn = 3;

my $word = get_word();
$word->{Visible} = 1;

my $doc=$word->Documents->Open('D:/test.docx');

my $WordToLookup="xy";

FindAndReplace();

sub FindAndReplace{
	$word->Selection->HomeKey(wdStory);
	$word->Selection->Find->{'Text'}=$WordToLookup;
	$word->Selection->Find->Replacement->{'Highlight'}=1;
	$word->Selection->Find->Execute({Replace=>wdReplaceAll});
}

sub get_word {
    my $word;
    eval {
        $word = Win32::OLE->GetActiveObject('Word.Application');
    };

    die "$@\n" if $@;

    unless(defined $word) {
        $word = Win32::OLE->new('Word.Application', sub { $_[0]->Quit })
            or die "Oops, cannot start Word: ",
                   Win32::OLE->LastError, "\n";
    }
    return $word;
}