Check for any "REV" (recovery) files in case one of the parts is corrupted.
Ensure you have every numbered part of the series (part01, part02, etc.).
Large files are often split into smaller "parts" to make them easier to upload and download. To access the contents, you generally need all parts (e.g., part01 through the final part) in the same folder.
High-definition video projects or disc images (ISOs) that exceed single-file upload limits. How to Use This File
Large repositories of vintage computer games or applications.