creating a virtual disk drive

I'm writing an encryption program and desire the ability to create a virtual disk drive that will be used to store encrypted files.
From what I've read, I will need to delve into the windows driver ddk. Does anyone know of an open source solution that I can  easily integrate into my app? I don't want to merely mirror directory locations with a drive letter, thanks for any info or links..

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Apart from creating a driver for a virtual drive, you could  create a  "shell namespace extensions" - see ("Shell Basics: Extending the Shell") for the greater picture and ("Implementing a Web View Namespace Extension Using Active Directory Services--MSJ, August 1998") for a not too simple example.

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>>I don't want to merely mirror directory locations with a drive letter, thanks for any info or links..

Why not?  Why use a more complicated solution, when a simple method can do the job?
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