FWIW, this still happens in 13.11.6 when using a RAR or 7z archive with a password. It doesn't seem to happen with ZIP files, though.
A quick test can be done using the latest version of this script, and opening a password-protected RAR or 7z archive with it.
Edit : Not necessary for the names to be encrypted.
Plugin Support API SDK.rar (1.1 MB)
(a sample file to make testing easier)