: The "003" in the filename may suggest that this is the third part of a split archive (e.g., .001, .002, .003). As noted on Microsoft Q&A , you typically need all numbered parts in the same folder to successfully extract the data. How to Use This File
This file utilizes the , which is an open-source container known for its high compression ratios and security features.
: The .7z extension signifies an archive created by or compatible with 7-Zip . According to Wikipedia , it supports advanced pre-processing and encryption algorithms.
I can then give you a more detailed review of the actual content inside the archive. How to Extract .7z.001 files - Microsoft Q&A