Manual:$wgMimeTypeBlacklist

Details
Files with these mime types will never be allowed as uploads if $wgVerifyMimeType is enabled.

Default value

 * 'application/x-msmetafile' was added in 1.5.5, 'application/zip' later (present at least since 1.14)
 * All other values were available since the setting was introduced in 1.5.0