Where to find .act's
 

Does anyone know where to find .acts? They're the encoding for Photoshop color palettes. If you go to Image: Mode: Indexed Color on an image, then you can go to Image: Mode: Color Table and give it a color effect, useful for stuff like flames.
Anyway, the point is, .act's are nowhere to be found. I searched Deviantart and several brush sites, but no one has them. Does anyone know where to download them?