Collect all numbered parts ( .001 through to the final part) in one directory. Right-click the .001 file.
If you only have the .001 file, you will encounter an "Unexpected end of data" error during extraction. You generally need the entire set to reconstruct the original file. How to Open SS-Mai-036_v.7z.001
Select > Extract Here . The software will automatically bridge the parts to produce the full uncompressed file. Do you have the other numbered parts of this archive, or Collect all numbered parts (