FlashLock

FlashLock is a folder
locking utility. Entire folders can be encrypted into one file. With the
appropriate password the file will open into a standard Windows folder and
can be manipulated like any other folder and when it is closed the folder
will be re-encrypted. Unlike other utilities which only encrypt each
individual file and leave them in place, FlashLock encrypts all the contents
of the folder and its subfolders into one single file and the individual
files in the folder can neither be listed nor viewed without decryption.
Uses the conventional encryption features of PGP.