You will need software capable of extracting .7z files, such as 7-Zip (Windows), Keka (macOS), or various other file managers. To help you specifically with this file, I'd need to know:
(Was it downloaded, or is it a personal backup?) 614281c39be5a5c7ac2d.7z
A "solid" mode groups similar files together, significantly improving compression ratios for large sets of small, similar files. You will need software capable of extracting
Ability to split large archives into multiple smaller volumes (e.g., .7z.001 , .7z.002 ) to facilitate easier sharing via email or transfer. such as 7-Zip (Windows)