: This indicates that the file is part 3 of a series. To successfully extract the original contents, you must also have the preceding parts, such as VID2016.7z.001 and VID2016.7z.002 , and potentially subsequent parts if the archive is even larger. How to Open and Combine the Parts

: Use the built-in Archive Utility or a third-party app like The Unarchiver to open the .001 file.

: If you are missing any segment (like .002 ), the extraction will fail with an error stating the archive is corrupted or incomplete.

: This is the primary extension for the 7-Zip archive format, known for its high compression ratios and open-source nature.