If you have Word installed, you can utilize Win32::OLE to make Word convert it for you.

use strict;

use Win32::OLE;
use Win32::OLE::Const 'Microsoft Word';
use File::Spec;

my ($input_html,$output_doc) = @ARGV;

my $word = Win32::OLE->CreateObject('Word.Application');
$word->{'Visible'} = 0;

my $file = $word->Documents->Open({
    FileName           => File::Spec->rel2abs($input_html),
    Format             => wdOpenFormatWebPages,
    ConfirmConversions => 0,
    AddToRecentFiles   => 0,
    Revert             => 0,
    ReadOnly           => 1,
    OpenAndRepair      => 0,
}) or die dump $word;

# Save As
$word->ActiveDocument->SaveAs({
    FileName   => File::Spec->rel2abs($output_doc),
    FileFormat => wdFormatDocument,
});

# Quit/Close
$file->Close({SaveChanges => wdDoNotSaveChanges});
$word->Quit( {SaveChanges => wdDoNotSaveChanges});
[download]

Of course Word's sense of HTML is somewhat limited, but mostly that works quite well.

-- Roman