I've not used PGP I'm afraid.
However Resco File Explorer 2003 may be worth a look to see if it can do what you need.
It supports RC2 and DES encryption up to 56-bit
Theres a review here:
http://www.hpcfactor.com/reviews/software/file-explorer-4-1/ encryption was only touched upon by the reviewer because of the ammount of features in the application that needed discussion.