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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
team.

Why do the add, delete, and update operations not working for some existing archives?

What about ACE archive support?


Why can't 7-Zip open some ZIP archives?

How can I install 7-Zip in silent mode?

 
Why do the add, delete, and update operations not working 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.
 
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 can't 7-Zip open some ZIP archives?

In 99% of these cases it means that the archive contains incorrect headers. ZIP archives contain
two copies of headers. 7-Zip reads both copies and won't open archives with incorrect data in
the headers. Other ZIP programs can open some archives with incorrect headers, since these
programs usually read only one copy of the headers, or they 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.

There is now also an extension to the ZIP format for strong encryption (AES) support. 7-Zip still
doesn't support this. It will be implemented later.

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.



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