Roxanne,
thank you for your suggestions. I'll have a look to the wiki. State-of-the-art document management system will be no solution here, because most of my clients are running a single user app on a standalone PC. They won't afford the costs and don't need the complexity of such a solution. It would be fine to integrate some basic doc man capabilities into my app - the only problem is how to secure the documents.
I've acquired quite a taste for a well-made mistake... [Fiona Apple]