Use a utility like 7-Zip or WinRAR . You only need to right-click the first file (.001) and select "Extract." The software will automatically pull data from part .004 to complete the extraction.
Ensure you have all sequential files in the same folder (e.g., .001 , .002 , .003 , and .004 ). SS-Mich-v-020.7z.004
Based on common naming conventions, this file likely belongs to: Use a utility like 7-Zip or WinRAR