The file you are referring to, .7z.004 , is the of a split multi-volume compressed archive created using the 7-Zip software.
To "get a piece" (i.e., access the contents) of this specific file, you cannot open it individually. Instead, you must follow these steps: 465776Гџ679595Гџ67859086406590) 7z 004
You can use 7-Zip on any computer, including a computer in a commercial organization. You don't need to register or pay for 7-Zip. How to Extract .7z.001 files - Microsoft Q&A The file you are referring to,