PKZIP 压缩文件的格式结构，只是文档-PKZIP compressed file format structure,

Theory of PKZIP cracking explained

The ZIP archives are created by the PkZIP/PkUnZIP combo produced by the PkWare company. The PkZIP programs have with LHArc and ARJ the best compression. The directory information is stored at the end of the archive, each local file in the arc