This is a 7-Zip multi-part archive . The .001 extension indicates it is the first segment. To extract the contents, you must have all subsequent parts (e.g., .002 , .003 ) in the same folder.
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 SS-Mai-036_v.7z.001
Collect all numbered parts ( .001 through to the final part) in one directory. Right-click the .001 file. This is a 7-Zip multi-part archive