Tools - Settings - Archiver plugins - Tab ZIP packer
The tab "ZIP packer: fcZip" offers settings for the FreeCommander's archiver plugin "fcZip".
The compression level may be defined in a range from "No compression" to "Maximum compression".
After clicking the button, the encryption method can be chosen. AES encryption is better as PKZIP classic.
Corrupted archive file: show message and try to open
If this setting is checked and a corrupted archive file is opened by "fcZip", a message is displayed. Afterwards "fcZip" will try to open the archive file anyway.