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7-Zip is a file archiver with highest compression ratio (920 Kb)

Highest compression ratio in new 7z format
7-Zip is free software distributed under the GNU LGPL
Supported formats: 7z, ZIP, CAB, RAR, ARJ, GZIP, BZIP2, 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 41 languages

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Is 7-Zip maked with AHK?

It's a topic for the Utilities & Resources forum, no ?

That's debatable - since it says it has a command line version, then in this instance it probably qualifies as something that could be useful to AHK users for automating compression tasks.

Otherwise, if a program isn't directly related to AHK use or easily automated via command line usage, then it's simply "some software" and there are plenty of freeware/shareware sites for those, or just use the General Forum if you think something is useful but not actually for AHK.

Just to clarify, the Utilities & Resources forum isn't just for things useful with AHK scripts. It's for anything likely to be of interest to the community.

7-Zip has been mentioned several times in this forum, but not specifically as an Utilities & Resources entry, so it is a welcome addition.

It has been my favorite zip tool for a long time, even thought I am not fan of the interface (no tree, drag'n'drop support introduced recently only, etc.).

I still have it in my context menu, but now my default application to open archives is IZArc, written in Delphi like many of its freeware equivalent (there is probably a good Delphi library for handling archives...).
Unlike many similar programs I tested, it has a good interface and very little bugs (despite being marked as beta). Note it supports the 7-Zip format... It supports more compression formats than 7-Zip. And of course, it is free.

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vPhiLho := RegExReplace("Philippe Lhoste", "^(\w{3})\w*\s+\b(\w{3})\w*$", "$1$2")

I use the command line version of 7-zip as well as the command line tools gzip.exe and tar.exe (which I believe are a bit faster then 7-zip for their specific formats, but I didn't tested it heavily).
The reason I use the command line tools is that I have a very tiny GUI running that allows drag and drop of files and folders, so I can easily compress the draged files in all the formats I want.
There are actually only two buttons for this feature, one is the "pack" button, a right mouse click alters through the pack formats zip/tar/gz and an "unpack" button, which unpacks everything that is droped regardless of the format. The GUI doesn't have a border, so the only things that are visible are the buttons at the upper center screen edge.

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Ciao
toralf