When a file is too large to easily upload, download, or fit on a single storage device, software like 7-Zip splits it into multiple "volumes".
The .7z tells you it was created using the 7z compression format. The .001 indicates it is of a sequence. part 2.7z.001
You will almost certainly need the subsequent parts— .7z.002 , .7z.003 , and so on—to actually see what’s inside. How to Open It (The "Golden Rule") When a file is too large to easily
: This usually means you are missing one of the parts or one of them is corrupted. Double-check that every file in the sequence is present. part 2.7z.001