Abstract: A file system is disclosed which includes a pair of attachable hang rails for suspending hanging files in a drawer. Each hang rail includes a horizontal bar, a vertical post and a connector segment. The front end of the horizontal bar includes a camming surface and a notch. The front end is inserted into a slot on the inside surface of a front wall of a drawer. The bottom edge of the slot provides vertical support for the horizontal bar. The camming surface acts with the bottom edge of the slot to cause the notch to straddle the top edge of the slot, thereby locking the horizontal bar in the slot and providing longitudinal and rotational stability. The vertical post is supported by a pair of bracing sleeves located on the back wall of a drawer which provide transverse and rotational stability. The vertical post rests on the bottom of the drawer to provide vertical support.