Put video files in iTunes without copying again to hard drive

I have a hefty amount of videos saved in a folder not associated with iTunes. However, I purchased an Apple TV, so I'd like them to show up in iTunes now. But I like the way they are organized in the other folder, for streaming to devices that read Windows Media Player.

What's the simplest way to make these files viewable in iTunes without having to double my hard drive usage? (I don't have the space).