CryptoSoft Enigma

From CryptoSoft:

(formerly Enigma 98) enables you to encrypt, decrypt, and wipe files and folders of any type. It supports various encryption engines such as 3DES, Blowfish, Cast-128 and some of the AES finalists including the new AES Rijndael along with zip compression. It also lets you easily create self-extracting encrypted zip files. This powerful program can combine several files in a single encrypted package and optionally wipe the original files. CS Enigma allows you to easily encrypt and decrypt your files and folder from within the Windows 95/98/2K/NT4 shell. CS Enigma adds a context menu entry to all valid files, folders, and drives. This lets you encode or decode them with right-click ease. Secure file deletion without encryption is also included. By using personal key files a secure key exchange can be established. Encryption disabled after 30 days, but decryption never expires.