[Update] 7-Zip v4.17 beta

[CoMa]

7-Zip
http://www.7-zip.org/

7-Zip is a file archiver for Windows 95/98/ME/NT/2000/2003/XP

The main features of 7-Zip:
- High compression ratio in new 7z format with LZMA compression
- 7-Zip is free software distributed under the GNU LGPL
- Supported formats: 7z, ZIP, CAB, RAR, ARJ, GZIP, BZIP2, Z,
TAR, CPIO, RPM and DEB
- For ZIP and GZIP formats 7-Zip provides compression ratio that
is 2-10 % better than ratio provided by PKZip and WinZip
- Self-extracting capability for 7z format
- Integration with Windows Shell
- Powerful File Manager
- Powerful command line version
- Plugin for FAR Manager
- Localizations for 53 languages


What's new in Version 4.17 beta:
- To increase protection from viruses, 7-Zip now does
not open files with more than 4 continuous spaces
in the name. And 7-Zip changes such long spaces
in name to " ... " in the file list.
- Code size optimization
- Some files were moved from main package to extra package:
- Plugin for FAR Manager
- SFX modules for installers (7zS.sfx and 7zSD.sfx)
- New localizations: Asturian, Indonesian




/CoMa

 

[Howard Schwartz]

High compression ratio in new 7z format with LZMA compression

Silly question, I am sure, but can other unzip utilities extract
files archived with the improved 7z compression?

I always like to be able to get at compressed files with a dos
program, for backup purposes, and in case windows is having
problems.

 

[wald]

Silly question, I am sure, but can other unzip utilities extract
files archived with the improved 7z compression?

Some can. I have IzArc over here, and it can handle 7z files.

Besides, 7Zip itself is perfectly usable from the commandline, so no
problem there.

Regards,
Wald

 

[trout]

Silly question, I am sure, but can other unzip utilities extract
files archived with the improved 7z compression?

I always like to be able to get at compressed files with a dos
program, for backup purposes, and in case windows is having
problems.

I wouldn't exect so. But for the heck of it, I downloaded it, zipped
a file (in 7z), and neither Winzip or PK Zip recognized it as a valid
archive.

 

[CoMa]

Silly question, I am sure, but can other unzip utilities extract
files archived with the improved 7z compression?

I always like to be able to get at compressed files with a dos
program, for backup purposes, and in case windows is having
problems.

Many of the free archive programs can unpack 7-Zip's own .7z format.

All the archive program I have tested can unzip .zip file
that 7-Zip has zipped.


/CoMa

 

[CoMa]

I wouldn't exect so. But for the heck of it, I downloaded it, zipped
a file (in 7z), and neither Winzip or PK Zip recognized it as a valid
archive.

The .7z format is NOT a zip format with a "strange" extension


WinZip, PK-Zip and WinAce can not unpack a .7z archive

TUGZip, ZipGenius, IZArc and many more freeware archive programs
can create and unpack .7z archives

Btw.
WinRAR can unpack a .7z archive



/CoMa

 

[CoMa]

7-Zip
http://www.7-zip.org/

7-Zip is a file archiver for Windows 95/98/ME/NT/2000/2003/XP

The main features of 7-Zip:
- High compression ratio in new 7z format with LZMA compression
- 7-Zip is free software distributed under the GNU LGPL
- Supported formats: 7z, ZIP, CAB, RAR, ARJ, GZIP, BZIP2, Z,
TAR, CPIO, RPM and DEB
- For ZIP and GZIP formats 7-Zip provides compression ratio that
is 2-10 % better than ratio provided by PKZip and WinZip
- Self-extracting capability for 7z format
- Integration with Windows Shell
- Powerful File Manager
- Powerful command line version
- Plugin for FAR Manager
- Localizations for 53 languages

7-Zip 4.18 beta

What's new:
- Bug in v4.17 beta was fixed: 7-Zip File Manager could
crash after some operations with archives


Download URL:
http://www.7-zip.org/dl/7z418b.exe
size: 1047 KB
date: 2005-04-19


/CoMa

 

[Matt]

7-Zip 4.18 beta

What's new:
- Bug in v4.17 beta was fixed: 7-Zip File Manager could
crash after some operations with archives

Download URL:
http://www.7-zip.org/dl/7z418b.exe
size: 1047 KB
date: 2005-04-19

One reminder (it surprised me)...
7-Zip supports multithreading (dual processor or Intel P4 with
hyperthreading) for 7Z format LZMA compression - with a worthwhile
increase in throughput.

I've been using the benchmark mode to load-test my new machine

 

[Howard Schwartz]

Some can. I have IzArc over here, and it can handle 7z files.

Besides, 7Zip itself is perfectly usable from the commandline, so no
problem there.

Many of the free archive programs can unpack 7-Zip's own .7z format.

All the archive program I have tested can unzip .zip file
that 7-Zip has zipped.

Let me be clear about command line decompression:

Many use compression programs, or backup programs that use, say, zip
compression to backup files.

What happens, if for instance, the registry gets messed up so you can not
boot windows at all or your MBR or boot records are damaged so you can
not even boot the disk that windows is on? These are typical recovery
situations.

To recover all or some files stored in a compressed archive, one would
like a program that can uncompress these files from a DOS or XP recovery
console command line -- not just the windows command line or run command.
Would will not be able to use windows/based program to restore anything
until recovery software restores windows.

It is thus convenient, sometimes absolutely necessary to have a program
that does not depend on booting the normal windows OS, to extract files
from an archive. PKunzip will, for instance, extract files with long
filenames from any zip archive, using only a dos 7x OS, and command line.

 

[Howard Schwartz]

Besides, 7Zip itself is perfectly usable from the commandline, so no
problem there.

Do you mean the windows command line, or a dos 7x command line,
or an XP recovery console command line -- or all of the above?

 

[wald]

Do you mean the windows command line, or a dos 7x command line,
or an XP recovery console command line -- or all of the above?

I leave it as an exercise to the OP to investigate that. The 7Zip
people advertise it as having a "Powerful command line version",
without further specifications. A quick search on the fora didn't
turn up any evidence of people using it from DOS boot disks or
recovery consoles.

Regards,
Wald

 

[CoMa]

Do you mean the windows command line, or a dos 7x command line,
or an XP recovery console command line -- or all of the above?

7z.exe and 7za.exe only work in the windows 32 text mode,
It don't run without windows.

But they say that 7-Zip's author is programming a 7-zip for DOS


BTW.
AdvanceCOMP
http://advancemame.sourceforge.net/comp-readme.html
Can compress/recompress/extract Zip files in DOS mode
AdvanceCOMP is using the Deflate 7-Zip implementation.



/CoMa