If you are missing any part (e.g., you have part 1 and 2 but not part 3), the extraction will fail with a "Volume Missing" or "CRC Error."
Multi-part archives are frequently used to hide malicious software from basic email scanners or web filters. Because the "malicious" code is split across several files, it may not be detected until it is fully extracted.
Here’s what’s typically important about such files: