If the original archive was protected, this part contains encrypted data that requires a password and the other parts of the set to decrypt.

A key feature of the file is that it is a split archive part , specifically the second volume of a multi-part compressed file. Main Feature: Multi-Part Continuity

This file is not a standalone archive. Its primary purpose is to hold a segment of data that was too large for a single file.

The 7z format uses advanced LZMA/LZMA2 compression , which provides a significantly higher compression ratio than standard ZIP files.