Cleaning up a VC++ 6 project

Question

I'm working with a very old and large VC6++ project and it's all messed up. There are unused files and folders everywhere, copies of folders and it's just a mess to clean it up by hand in its current state.

It will be done eventually, but is there any simple way to check what files and folders are used when it does a clean compile?

The project settings doesnt help me at all because it simply uses copies of folders and additional include directories.

Any suggestions?