You can use 7-Zip on any computer, including a computer in a commercial organization. You don't need to register or pay for 7-Zip. www.7-zip.org
: You can extract it via the terminal using the command: 7z x pets.7z.001 .
: Use free archive utilities like The Unarchiver or Keka . Open the application, drag and drop the .001 file into it, and it will automatically join and extract the sequence.
: Use a file management app capable of handling split archives, such as ZArchiver or RAR . Open the app, navigate to the folder, and extract the .001 file. How many total parts do you have for this specific file? How to Extract .7z.001 files - Microsoft Q&A
12 May 2020 — 7zip file with numbers on it like 001 means that you only have a part file of the whole compressed file. learn.microsoft.com
How to Extract Multiple 7ZIP Files at Once [.7z.001 .7z.002 .7z.003...]