You can get a distribution for libtidy at:
http://tidy.sourceforge.net/src/tidy_src.tgz
##</code><code>##

system( 'c:/tidy/tidy.exe',
        '-asxml',
        '-config',
        'c:/tidy/tidy.cnf',
        '-f',
        $error_file,
        '-m',
        $html_file );