•When the files in the archive are stored encrypted but without compression, attacks may run slower than expected (especially on large files), because decrypting the whole file is required (unless you know the first several bytes of the encrypted file).

•If the archive contains two or more encrypted files, the program assumes that all of them are encrypted with the same password (see Files with different passwords for a workaround).

•The program does not support ZIP archives that use the dclimplode compression method (available in PKWARE Date Compression Library)

•The program does not support Strong Encryption Specification (EFS) available in PKZip 5 and above