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- Extract Compressed Files Windows 10
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- Extracting Zip Files
My computer can still open.zip files downloaded prior.-I have attempted downloading the same.zip files 3 times on both chrome and nightly. The browser used to download does not seem to make a difference.-Windows Explorer cannot open the files. Winrar can, but says that the archive is corrupt when attempting to extract the files.
How to uncompress *.gz and *.Z files
Files available from the NCBI anonymous FTP site have been compressed using the 'gzip' program (and have the extension *.gz), or the UNIX 'compress' program (and have the extension *.Z). This document describes how both file types can be uncompressed.
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| Uncompress *.gz files |
| As announced via the GenBank newsgroup on June 15, 2000, NCBI now uses the gzip compression utility instead of the Unix 'compress' utility for all GenBank files, starting with GenBank Release 119.0. Comparisons of gzip to compress for simplistic sequence data (e.g., EST, GSS, STS) yielded an additional 50% reduction in the size of a compressed file. Given that ESTs and GSS sequences comprise a huge portion of the GenBank data NCBI distributes, switching to gzip saves a great deal of disk space, and reduces the amount of bandwidth utilized by those who ftp GenBank files. As a result of the switch to gzip, file naming conventions have changed. The suffix of compressed GenBank data files was previously '.Z' . After the switch, the suffix became '.gz' . The gzip utility is used to compress various other data on the ftp site as well. If you are unsure about the availability of gzip for your platform, please contact your system administrator. If you find that the utility is not installed, one possible place for obtaining gzip is:http://www.gnu.org/software/gzip/gzip.html |
| Uncompress *.Z files |
| Files with a *.Z extension have been compressed by the UNIX 'compress' program. Those files can be handled with the Unix 'uncompress' program, or programs such as the PC and Mac utilities described below. |
| UNIX |
| If you are using a UNIX workstation, use the uncompress program to expand the files to their original state. |
| PC |
If you are using a PC, you will need two programs (pkunzip & comp430d.zip) in order to uncompress a *.Z file. If you do not already have the pkunzip program on your PC, please contact your systems administrator to obtain it, or search the Net to find a Web site from which you can download that program. The 'comp430d.zip' freeware program is available from the 'pub/dab' directory the NCBI anonymous FTP site (ftp://ftp.ncbi.nih.gov/pub/dab/). It allows you to decompresses Unix '.Z' files under DOS. Once you download the 'comp430d.zip' file, follow these steps:
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| MAC |
If you are using a Mac, you can search the Web to find sites that have a program such as 'MacCompress,' which handles files that have been prepared with the Unix compress program. One example web site that provides information about various Mac compression/uncompression programs is:
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| Compression Newsgroup FAQs |
| You can find additional information about compression/uncompression utilities on the Compression Newsgroup. They provide an archive of Frequently Asked Questions (FAQs) at:http://www.faqs.org/faqs/compression-faq/ You might also search the web to find sites that provide compression/uncompression software for various platforms. |
Revised June 3, 2002
7-Zip is a file archiver with a high compression ratio.
Download 7-Zip 19.00 (2019-02-21) for Windows:
| Link | Type | Windows | Size |
|---|---|---|---|
| Download | .exe | 32-bit x86 | 1.2 MB |
| Download | .exe | 64-bit x64 | 1.4 MB |
Download 7-Zip 21.01 alpha (2021-03-09) for Windows:
| Link | Type | Windows | Size |
|---|---|---|---|
| Download | .exe | 32-bit x86 | 1.2 MB |
| Download | .exe | 64-bit x64 | 1.4 MB |
| Download | .exe | 64-bit ARM64 | 1.5 MB |
License
7-Zip is free software with open source. The most of the code is under the GNU LGPL license. Some parts of the code are under the BSD 3-clause License. Also there is unRAR license restriction for some parts of the code. Read 7-Zip License information.
Extract Compressed Files Windows 10
You can use 7-Zip on any computer, including a computer in a commercial organization. You don't need to register or pay for 7-Zip.
The main features of 7-Zip
- High compression ratio in 7z format with LZMA and LZMA2 compression
- Supported formats:
- Packing / unpacking: 7z, XZ, BZIP2, GZIP, TAR, ZIP and WIM
- Unpacking only: AR, ARJ, CAB, CHM, CPIO, CramFS, DMG, EXT, FAT, GPT, HFS, IHEX, ISO, LZH, LZMA, MBR, MSI, NSIS, NTFS, QCOW2, RAR, RPM, SquashFS, UDF, UEFI, VDI, VHD, VMDK, WIM, XAR and Z.
- For ZIP and GZIP formats, 7-Zip provides a compression ratio that is 2-10 % better than the ratio provided by PKZip and WinZip
- Strong AES-256 encryption in 7z and ZIP formats
- Self-extracting capability for 7z format
- Integration with Windows Shell
- Powerful File Manager
- Powerful command line version
- Plugin for FAR Manager
- Localizations for 87 languages
7-Zip works in Windows 10 / 8 / 7 / Vista / XP / 2019 / 2016 / 2012 / 2008 / 2003 / 2000.
p7zip - the port of the command line version of 7-Zip to Linux/Posix.
Extract Compressed Files Online
On 7-Zip's SourceForge Page you can find a forum, bug reports, and feature request systems.
Compression ratio
We compared 7-Zip with WinRAR 5.20.
FILE SETS: Mozilla Firefox 34.0.5 for Windows and Google Earth 6.2.2.6613 for Windows.
Extract Compressed Files
| Archiver | Mozilla Firefox | Google Earth | ||
|---|---|---|---|---|
| 65 files 85 280 391 bytes | 483 files 110 700 519 bytes | |||
| Compressed size | Ratio | Compressed size | Ratio | |
| 7-Zip 9.35 -mx | 39 357 375 | 100% | 15 964 369 | 100% |
| WinRAR 5.20 -m5 -s -ma5 -md128m | 41 789 543 | 106% | 17 035 432 | 107% |
Extracting Zip Files
Compression ratio results are very dependent upon the data used for the tests. Usually, 7-Zip compresses to 7z format 30-70% better than to zip format. And 7-Zip compresses to zip format 2-10% better than most of other zip compatible programs.
