: This indicates that the file was compressed using the open-source 7-Zip archive manager .
A valid 7-Zip file should start with the signature bytes 37 7A BC AF 27 1C . Cousins4.7z.001
copy /b Cousins4.7z.001 + Cousins4.7z.002 Cousins4.7z Linux/Mac: cat Cousins4.7z.* > Cousins4.7z 2. Extract the Contents : This indicates that the file was compressed