This is the easiest way for most users to browse the archive's structure. the Olives2.7z file. Select 7-Zip > Open archive .
WinZip opens and extracts 7z Compressed Archive Files—and many more formats. How to Extract .7z.001 files - Microsoft Q&A
7zip file with numbers on it like 001 means that you only have a part file of the whole compressed file. Microsoft Learn 7-ZIP File Format - Everything You Need to Know