To access the contents, you must have the 7-Zip utility or a compatible program like WinRAR installed.

7zip file with numbers on it like 001 means that you only have a part file of the whole compressed file. Microsoft Learn Does 7z compress better than zip? - Microsoft Community Hub

: It utilizes the 7z format, which is known for high compression ratios, often outperforming the standard ZIP format. How to Open and Extract It