The LockBox looks and acts much like a regular windows folder, except it is opened with a password. Any files dragged into the LockBox are protected with a strong encryption algorithm. Files can be run or modified from directly within the LockBox, without compromising security. Large files can optionally be partially encrypted so they can be stored / used faster.
This software is a shareware. You will be able to download and test LockBox during a certain period of time, then, if it does what you need, you will have to acquire the full version from LockBox publisher. The LockBox 2.11 free trial version contains an installer and an uninstaller, and has a size of 600 Kilobytes.
For additional information and support request, please contact directly LockBox publisher.

LockBox Screenshot