: The .007 suffix suggests this is the 7th volume of a multi-part split archive.
: Run 7z x SSMichSS-001.7z to automatically combine and extract all volumes. SSMichSS-007.7z
: Ensure you have all preceding parts ( SSMichSS-001.7z through SSMichSS-006.7z ) in the same directory. Extract the Archive : SSMichSS-007.7z