12 May 2020 — 7zip file with numbers on it like 001 means that you only have a part file of the whole compressed file. Microsoft Learn How to Open and Extract .001 Files - Microsoft Q&A
: Ensure mm_002.7z.001 , mm_002.7z.002 , mm_002.7z.003 , and mm_002.7z.004 are in the same directory.
The file is the fourth part of a split multi-volume 7-Zip archive. Key Characteristics
: To open or extract the contents, you must have all previous parts (e.g., .001 , .002 , .003 ) and any subsequent parts in the same folder. Format : It uses the 7-Zip (.7z) compression format. How to Extract