File Extension Library

.7-ZIP File Extension

  • Developer by: Igor Pavlov
  • Category: Archive and compressed Files

What are .7-ZIP files and how to open them?

Can't open .7-ZIP file? Are you wondering what it contains? On our site we will explain to you what this file is, what it is used for and what software opens the .7-ZIP file.

What is a .7-ZIP file extension?

.7-ZIP file extension is created by Igor Pavlov. .7-ZIP has been classified as Archive and compressed Files.

.7-ZIP is 7z compressed archive

The 7-zip file extension is used for native file format of 7-ZIP archiver

7z is the new backup and archive file format, providing high compression ratio.

The main features of 7z file format:
- Open architecture
- High compression ratio
- Strong AES-256 encryption
- Ability of using any compression, conversion or encryption method
- Support for very large files with sizes up to 16000000000 GB
- Unicode file name support
- Solid compression ratio
- Archive headers compression

7z file format has an open architecture, so it can support any new compression methods. LZMA is the default and general compression method of 7z file format.
The main features of LZMA are:

  • Variable dictionary size (up to 4 GB)
  • Compression speed: about 1 MB/s on 2 GHz CPU
  • Decompression speed: about 10-20 MB/s on 2 GHz CPU
  • Small memory requirement for decompression (depend from dictionary size)
  • Small code size for decompression: about 5 KB
  • Supports multi-threading and P4's hyper-threading

The LZMA compression algorithm is very suitable for embedded applications. LZMA is released under the terms of the GNU LGPL.

7-Zip supports encryption with the AES-256 algorithm. This algorithm uses a cipher key with a length of 256 bits. To create that key, 7-Zip runs a derivation function based on a SHA-256 hash algorithm. A key derivation function produces a derived key from the text password entered by the user. To increase the cost of an exhaustive search to crack a password, 7-Zip uses a large number of iterations when it produces a cipher key from a password.

7z file format was developed as as part of the 7-Zip compression utility distributed under the GNU LGPL.

MIME types:

How to open:

Use 7-zip, or applications that support 7z archives include WinRAR, PowerArchiver, TUGZip, and IZArc.

How to convert:

Extract an archive and then use files from archive or backup files into another archive file format (eg. rar, zip etc.)

How to fix problems with .7-ZIP files

  1. You need to update the application that you normally use to open .7-ZIP files. Only the latest version of the software supports the current .7-ZIP file format
  2. You need to check the .7-ZIP file for viruses. To do this, you need to scan it with a popular antivirus (Norton, Nod32, Kaspersky, Dr.Web, etc.)