A split zip archive consists of multiple files. One file will have a ".zip" extension. The rest of the files will have extensions ".z01, .z02, ...etc". Its important that all these files are in the same folder when reading and extracting the multi-part archive, otherwise you may run into errors. Click on the file with the ".zip" extension to view the multi-part archive. You can then extract the archive like any other Zip archive.

NOTE: ExpressZip does not allow you to edit a split zip archive(add or remove files).

Creating split zips:

Often things like email servers have a maximum size for files that can be sent so you may need to split up your zip into smaller parts that can be sent. To create a multi-part (split zip) archive you must first open a Zip file (.zip extension) that is not already a multi-part archive. Then click the "Split" option under "Tools". Identify the file to save to, select a split size, and click "Split Zip". If you want to overwrite the existing Zip file with the multipart archive, simply use the default save file name and click "Yes" when prompted about the overwrite.

NOTE: This process will create multiple files with the same name but different extensions. One file will have a ".zip" extension and the rest will have extensions ".z01, .z02, ...etc". Keep these files together.