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7-Zip Portable FAQ
Check our Frequently Asked Questions to get a quick answer to the most common inquiries.
The FAQ page features selected solutions for users' reference by the PenZoft technical support
|Why do the add, delete, and update operations not working for some existing
The current version of 7-Zip can't execute some operations with .7z archives that have been
created with the "solid" option switched on.
|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
|Why can't 7-Zip open some ZIP archives?
In 99% of these cases it means that the archive contains incorrect headers. ZIP archives contain
If you have such archive, please don't call the 7-Zip developers about it. Instead try to find the
|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.