Symptoms

1. On a Mac, you create file-level backup of some folders.
2. You download the archive to a Windows machine.
3. You try to open the archive.
4. Error appears:
   Windows cannot open the folder.
   The Compressed (zipped) Folder <path> is invalid.

Cause

Windows Explorer cannot extract a folder from the backup created on a Mac.

Solution

Use a third-party archiver (e.g. 7-Zip) to work with the archive.