The .001 indicates it is the very first part of the sequence.
Here is everything you need to know about what these files are and how to actually use them. What Exactly is a .7z.001 File? A file ending in .7z.001 is a . 1 (7)-7 & 1 (8)-8.7z.001
For the archive to work, you must have all subsequent parts (e.g., .002 , .003 ) in the same folder. Common Errors: "Unexpected End of Data" 1 (7)-7 & 1 (8)-8.7z.001
To get the actual content out of these parts, you need a specialized file archiver. 1. Download the Right Tool 1 (7)-7 & 1 (8)-8.7z.001
Demystifying Split Archives: A Guide to Opening .7z.001 Files