Frequently Asked Questions (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 doesn't the command line version add files that do not have any extension?

You probably used a *.* wildcard. 7-Zip doesn't use the Windows system wildcard parser; so, 7-Zip doesn't follow the archaic rule by which *.* matches every file name. 7-Zip treats *.* as matching only a file name with an extension. To process all files, you must use a * wildcard or just omit the wildcard entirely.

Why doesn't adding, deleting or updating an existing archive work?

The current version of 7-Zip cannot change an archive created with the solid option switched on. To update a .7z archive you must create and update the archive in non-solid mode (-ms=off switch)

What about support for ACE archives?

Support for ACE can be implemented, if the source code of that format is made available, and if the source code license will allow using that code.