ZIP format has versions. ZIP 2.0 (released 1993) supports:
Modern tools still read/write ZIP 2.0 but prefer ZIP 3.0+ (AES-256, >4GB files). If you see “2vzip”, it may mean:
How to alter a 31-part ZIP 2.0 archive:
The “31P” engine lives up to its name: it compresses files with a 31‑percent reduction on average while preserving quality, then streams them via the 2VZIP protocol. In my tests, a 2 GB video file uploaded in under 30 seconds and was ready for download in just a few more seconds—far faster than the typical cloud services I use.
Step 1 – Identify your actual file type
Rename or inspect with file command (Linux/macOS) or TrID (Windows).
If the file is indeed a corrupt or obfuscated archive, try Zip2Fix or 7-Zip → Repair. ZIP format has versions
Step 2 – Alter contents
Step 3 – Split into 31 parts again (if required)
7z a -v25m -tzip finalarchive.zip folder/
This creates finalarchive.zip.001 through .031 if folder > 775MB. Modern tools still read/write ZIP 2
Step 4 – Upload & share with verification
Step 5 – Verified download
Recipient downloads all 31 parts, runs md5sum -c checksums.txt, then rejoins with cat finalarchive.zip.* > final.zip. How to alter a 31-part ZIP 2
Even on the free tier you get 10 GB of storage, 100 GB of monthly bandwidth, and the full suite of verification tools. The paid plans (starting at $4.99 / month) scale nicely for power users, offering unlimited storage, priority support, and advanced compliance reports for enterprises.