AxCrypt is free and easy to use open source strong file encryption for Windows 95/98/ME/NT/2K/XP, integrated with Windows Explorer. Encrypt, compress, decrypt, wipe, view and edit with a few mouse clicks. Cryptographic primitives are AES-128 and SHA-1.

AxCrypt Features
Double-click to edit/view with any application.
Automatic re-encryption after modification.
Absolutely no user configuration necessary or possible before use.
Open source under GNU General Public License.
7 languages in one executable distribution.
Extensive command-line interface for scripting and programming.