The .7z extension indicates it is a 7-Zip compressed archive, known for high compression ratios. The .008 suffix signifies that this is the eighth part of a multi-volume split archive.
You need every segment from the set (e.g., .001 through at least .008). 5t3f4nFr03l1ch.7z.008
Use a program like 7-Zip or WinZip . Right-clicking on the first part (.001) and choosing "Extract" will automatically join all subsequent parts to reveal the original file. Do you have the other parts of this archive, or Does 7z compress better than zip? - Microsoft Community Hub 5t3f4nFr03l1ch.7z.008