ZIP files are "compressed" folders that save space and bundle multiple files into one for easier sending. Zip and unzip files - Microsoft Support

: Place all parts (the .zip , .z01 , and .z02 ) in the exact same folder .

If you have a file ending in .z02 , you likely have a set of files that look like project.zip , project.z01 , and project.z02 .

: Always right-click the file with the .zip extension (the primary file), not the .z01 or .z02 files. The software will automatically pull data from the other parts to reconstruct the original content. 📂 General ZIP File Quick Guide

🛠️ Working with Multi-Part ZIP Files ( .z01 , .z02 , etc.)

: Built-in Windows or Mac tools often can't handle split archives. It is highly recommended to use 7-Zip or WinZip .