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AZip is a free Zip Archive Manager with unique features such as: built-in content Search, smart archive Update, archive Recompression. The goal is to keep the user interface as simple as possible and bother the user the least possible with options or useless gadgets.

Features:

Aimed at simplicity, minimal option set
Usual archive management: Add / Remove / Extract files
Original, useful tools:
Super-fast built-in Search function: you can search for contents and/or entry names through an archive - no need to extract the archive yourself and to try a search with some file explorer. NB: during the search, files are not even extracted to temp files; all happens quickly in memory!
Fast archive Updater: changes only new, modified files.
Archive Recompression, for reducing further the size of archives. This is useful for squeezing savegames or database backups, or for sending large data by e-mail.
Flat view / Tree view
Multi-document
Methods supported: Reduce, Shrink, Implode, Deflate, Deflate64, BZip2, LZMA
Encryption
Portable (no installation needed, no DLL); can operate with a config file instead of the registry
Free, open-source