方法：在程序源码中找到并编辑 wp-includes/functions.php ，查找 application/zip ，在该段下面添加 'rar' => 'application/rar',

如：

		'onetoc|onetoc2|onetmp|onepkg' => 'application/onenote',
		'swf' => 'application/x-shockwave-flash',
		'class' => 'application/java',
		'tar' => 'application/x-tar',
		'zip' => 'application/zip',
		'rar' => 'application/rar',
		'gz|gzip' => 'application/x-gzip',
		'exe' => 'application/x-msdownload',

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