Standard Windows tools like WinZip may struggle with multi-part files. It is recommended to use WinRAR or 7-Zip on Windows, or The Unarchiver for Mac.
Ensure all subsequent files (e.g., ex01.part2.rar , ex01.part3.rar ) are in the same folder as the first part.
Do you have (part2, part3, etc.) for this archive in the same folder? What is a RAR File - Cloudmersive APIs