Index: includes/DefaultSettings.php =================================================================== --- includes/DefaultSettings.php (revision 20824) +++ includes/DefaultSettings.php (working copy) @@ -1380,7 +1380,7 @@ /** Files with these extensions will never be allowed as uploads. */ $wgFileBlacklist = array( # HTML may contain cookie-stealing JavaScript and web bugs - 'html', 'htm', 'js', 'jsb', + 'html', 'htm', 'js', 'jsb', 'mhtml', 'mhtm', 'mht', # PHP scripts may execute arbitrary code on the server 'php', 'phtml', 'php3', 'php4', 'php5', 'phps', # Other types that may be interpreted by some servers