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Frequently Asked Questions (FAQ)
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- User FAQ -
- Developer FAQ -
User FAQ
- -Can I use 7-Zip in a commercial organization?
-Yes, 7-Zip is free software. You can use it on any computer. You don't need to -register or pay for 7-Zip.
- -Why do the add, delete and update operations not work for some existing archives?
-The current version of 7-Zip can't execute some operations with .7z archives that have been -created with the "solid" option switched on. You can disable solid mode with -ms=off switch -in command line
- -What about ACE archive support?
-Support for ACE archives could be implemented in 7-Zip, if the source code -of that format was available, and the license allowed it. The Unace.dll -library from the authors of the ACE program is not -compatible with the plugin interface of 7-Zip (Unace.dll works with files, but -7-Zip only allows plugins to work with abstract streams). For this reason 7-Zip can't use -Unace.dll without a complex wrapper.
- -Why doesn't the command line version add files without extensions to an archive?
-You're probably using a *.* wildcard. 7-Zip doesn't use the operating system's wildcard mask parser, -and consequently treats *.* as any file that has an extension. -To process all files you must use the * wildcard instead or omit the wildcard altogether.
- -Why can't 7-Zip open some ZIP archives?
-In 99% of these cases it means that the archive contains incorrect headers. -Other ZIP programs can open some archives with incorrect headers, since these programs -just ignore errors.
-If you have such archive, please don't call the 7-Zip developers about it. -Instead try to find the program that was used to create the archive and inform the developers -of that program that their software is not ZIP-compatible.
- -How can I install 7-Zip in silent mode?
- -Use the "/S" parameter to do a silent installation and the "/D=dir" parameter -to specify the "output directory". These options are case-sensitive. -7-Zip uses the NSIS installer by Nullsoft.
- - -Developer FAQ
- -Why are there linking errors when I compile 7-Zip or LZMA SDK with Visual C++ 6.0?
- -To compile sources you will need Visual C++ 6.0 or a later version. -Some files also require a new Platform SDK from microsoft.com:
- -http://www.microsoft.com/msdownload/platformsdk/sdkupdate/psdk-full.htm -or - -http://www.microsoft.com/msdownload/platformsdk/sdkupdate/ - -If you are using MSVC, specify the SDK directories at the top of the "Include files" and -"Library files" directory lists. These can be found under "Tools / Options / Directories".
-The latest Platform SDK is not compatible with MSVC6. So you must use -Windows Server 2003 PSDK (February 2003) with MSVC6.
- -Can I use the EXE or DLL files from 7-Zip in a Commercial Application?
- -Yes, but you are required to specify in your documentation (1) that -you used parts of the 7-Zip program, (2) that 7-Zip is licensed under the GNU LGPL license and -(3) you must give a link to www.7-zip.org, where the source code can be found.
- -How can I add support for 7z archives to my application?
- -One way is to use the 7za.dll (available from sf.net for download). The 7za.dll -works via COM interfaces. It, however, doesn't use standard COM interfaces for -creating objects. You can find a small example in the source code. A full example is -7-Zip itself, since 7-Zip works via this dll also. There are other applications -that use 7za.dll such as WinRAR, PowerArchiver and others.
- -The other way is to call the command line version: 7za.exe.
- -Can I use the source code of 7-Zip in a commercial application?
- -Since 7-Zip is licensed under the GNU LGPL you must follow the rules of that license. -In brief, it means that any LGPL'ed code must remain licensed under the LGPL. For -instance, you can change the code from 7-Zip or write a wrapper for some code -from 7-Zip and compile it into a DLL; but, the source code of that DLL (including -your modifications / additions / wrapper) must be licensed under the LGPL or GPL. -Any other code in your application can be licensed as you wish. -This scheme allows users and developers to change LGPL'ed code and recompile -that DLL. That is the idea of free software. Read more here: -http://www.gnu.org/. - -You can also read about the LZMA SDK, which is available -under a more liberal license.
- -Copyright (C) 2008 Igor Pavlov.
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