Unity Editor DLL's

I have a scenario where I need access to System.Data in my editor scripts. Unity includes the DLL in it's Framework directory. However, it does not link to it during run time. I want to be able to access the DLL in my editor scripts but not the actual unity application. If I place the DLL in an 'Editor' folder, will Unity not include it in the application build (just like script files)?

Placing DLL's into an folder named 'Editor' will ensure that they are only referenced by the editor scripts.