.zup后缀的文件 用什么打开

是ZIP吧？zip文件就是压缩文件，样子就是书本的样子！用winrar解压缩一下就可以了。
如果真是zup文件的话，请参考以下资料
Details for file extension .ZUP are on this page. Because there is no central registry for file extensions and their associated programs there may be multiple entries on this page. And, because there are many (some say over a million) such associations not all may be listed here. A search on the file extension you submitted shows 1 record(s).
参考资料：http://filext.com/file-extension/zup