Thread:Extension talk:WPMW/Must the wiki be under the WP?/reply

I haven't tested it, but in theory yes. You'll find the following at the top of the extension script:

// Relative path to Wordpress installation. In the default '..' we // have MediaWiki installed in a 'wiki' directory off the main // Wordpress root. $WP_relpath='..';

That's the relative path FROM the wiki to WordPress. It sounds like in your case, you could set it to '.' and it would work.