The .z01 extension indicates that this is the in a sequence created by compression software like WinZip or 7-Zip . A standard multi-part ZIP archive typically consists of:
: Named November29.z01 , November29.z02 , and so on. These volumes contain the actual compressed data bits that didn't fit into a single file. Purpose and Function November29.z01
: Usually named November29.zip . This file contains the central directory (the "index") of the entire archive. November29.z01
Split archives like "November29.z01" were historically popularized to fit large programs onto multiple floppy disks or CDs. Today, they are primarily used to bypass: Downloads with multiple parts (.z01 and .z02 files) November29.z01