: Use a tool like 7-Zip or WinRAR to extract the first part. It will automatically detect and join the other segments to reconstruct the original file.
If this is a forensic challenge (suggested by the "vhs" and "07" numbering common in structured training sets), follow these standard investigative steps: HCB2-vhs-07.7z.001
: Use Autopsy or FTK Imager to browse the file system. : Use a tool like 7-Zip or WinRAR to extract the first part