Jeroen,
Have you looked at the other tools on MCA's site that I directed you to? For what reason do you want to encrypt? To prevent reverse engineering or to hide security stuff like passwords? Follow some of the links on MCA's site (they point back to this forum). They go into good detail on the pitfalls of encryption. Namely, that the decription is done entirely on the client side. Meaning, what the software can do, I savy person can as well!
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Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.