Manual:DumpHTML.php

dumpHTML.php is a script that allows to make a simple HTML-dump of a MediaWiki installation.

You'll need a console-based command like  for Linux. You can't execute the file with your browser, because you aren't able to use parameters.

Parameters
For example (Linux): /usr/bin/php /opt/mediawiki/maintenance/dumpHTML.php -d C:\wikidump -k monobook