Intercepting Finder file events?

[btoth]

I'd like to find a way to have my program get notified when a user moves a file in the Finder to another folder, so that I could find the original path before the file gets copied to its new location. I'm guessing that this really isn't possible.

Since I'm using Cocoa, I've been looking into NSAppleEvent and AppleScript but I think I'm totally wrong here. NSWorkspace doesn't seem to offer anything either.