Wikimedia Bugzilla is closed!

When editing a page using Internet Explorer 6, Mediawiki says "Your browser is not unicode-compliant, 
blahblah".

I did some debugging and found:
In the file includes\DefaultSettins.php, 
several REGEXP patterns are defined on non-compliant browsers:

$wgBrowserBlackList = array(
        /**
         * Netscape 2-4 detection
         * The minor version may contain strings such as "Gold" or "SGoldC-SGI"
         * Lots of non-netscape user agents have "compatible", so it's useful to check for that
         * with a negative assertion. The [UIN] identifier specifies the level of security 
         * in a Netscape/Mozilla browser, checking for it rules out a number of fakers. 
         * The language string is unreliable, it is missing on NS4 Mac.
         * 
         * Reference: http://www.psychedelix.com/agents/index.shtml
         */
        '/^Mozilla\/2\.[^ ]+ .*?\((?!compatible).*; [UIN]/',
        '/^Mozilla\/3\.[^ ]+ .*?\((?!compatible).*; [UIN]/',
        '/^Mozilla\/4\.[^ ]+ .*?\((?!compatible).*; [UIN]/',  
#NOTE THIS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

        /**
         * MSIE on Mac OS 9 is teh sux0r, converts þ to <thorn>, ð to <eth>, Þ to <THORN> and Ð to <ETH>
         *
         * Known useragents:
         * - Mozilla/4.0 (compatible; MSIE 5.0; Mac_PowerPC)
         * - Mozilla/4.0 (compatible; MSIE 5.15; Mac_PowerPC)
         * - Mozilla/4.0 (compatible; MSIE 5.23; Mac_PowerPC)
         * - [...]
         *
         * @link http://en.wikipedia.org/w/index. ... &oldid=12355864
         * @link http://en.wikipedia.org/wiki/Template%3AOS9
         */
        '/^Mozilla\/4\.0 \(compatible; MSIE \d+\.\d+; Mac_PowerPC\)/'
);

And in the file includes\EditPage.php, the current browser's USER-AGENT string is checked against the 
patterns:

        function checkUnicodeCompliantBrowser() {
                global $wgBrowserBlackList;
                if( empty( $_SERVER["HTTP_USER_AGENT"] ) ) {
                        // No User-Agent header sent? Trust it by default...
                        return true;
                }
                $currentbrowser = $_SERVER["HTTP_USER_AGENT"];
                foreach ( $wgBrowserBlackList as $browser ) {
                        if ( preg_match($browser, $currentbrowser) ) {
                                return false;
                        }
                }
                return true;
        }

Note the 3rd pattern, 
        '/^Mozilla\/4\.[^ ]+ .*?\((?!compatible).*; [UIN]/',  
it will match the IE6's USER-AGENT string on my machine, whick is shown below:
  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; iebar; .NET CLR 1.1.4322; InfoPath.1)

Please note the "InfoPath.1" part near the end of the string, it is there because I installed InfoPath, 
a component of Microsoft Office 2003. The starting letter 'I' makes it matched with the 3rd pattern.