contact@unzippr.com — one person, read between builds
Worth writing about: an archive that refused to open — paste the exact message (the errors name their reasons: ZIP64, method numbers, a missing directory) and where the zip came from; every source has habits. A ✓/✗ that saved or sank a deadline. A browser where unzip-to-folder misbehaves. And votes: password support and ZIP64 are both buildable, and mail is what decides their order.
Honestly outside what I can help with: .rar and .7z — different containers, part-proprietary engines; the answer stays no until it can be a hand-rolled yes. Repairing corrupt archives past a checksum diagnosis — recovery is forensics, not opening. And multi-gigabyte files — browser memory is the honest ceiling, and desktop tools exist for a reason.