Large files are often split into smaller segments (like .001 , .002 , .003 ) to make them easier to upload or store.

This likely refers to Solid Compression , a feature in the 7z format that treats all files as a single continuous data stream. While this improves the compression ratio (especially for many similar small files), it means you cannot easily extract individual files without processing the entire archive. How to Open It

Do you have the of this file in the same folder? Does 7z compress better than zip? - Microsoft Community Hub

The file extension indicates that it is the first part of a multi-volume compressed archive created by the 7-Zip software. The garbled text in the filename is likely due to an encoding mismatch (often called mojibake) or intentional obfuscation. Key Characteristics