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Claim 1

IN COMBINATION WITH A HANGING FILE FOLDER HAVING ON ONE STRAIGHT EDGE PORTION THEREOF A U-SHAPED EDGE REINFORCEMENT MEMBER COMPRISING FRONT AND REAR DEPENDING PORTIONS WITH BOTTOM EDGES EXTENDING LENGTHWISE OF SAID STRAIGHT EDGE PORTION, SAID FRONT AND REAR PORTIONS DISPOSED ON OPPOSITE SIDES OF SAID EDGE PORTION WITH SAID BOTTOM EDGES CLOSELY ENGAGING SAID EDGE PORTION, SAID REAR PORTION HAVING AN ELONGATED GROOVE EXTENDING PARALLEL TO SAID EDGE PORTION; AN INDEX TAB HOLDER, SAID TAB HOLDER BEING FORMED OF RESILIENT PLASTIC AND COMPRISING A FIRST PORTION ADAPTED TO HOLD AN INDEX TAB AND A SECOND INTEGRALLY JOINED FOLDER-MOUNTING PORTION REMOVABLY MOUNTED ON SAID REINFORCEMENT MEMBER, SAID FOLDER-MOUNTING PORTION COMPRISING A BODY PORTION AND FRONT AND REAR SPACED LEGS INTEGRALLY FORMED WITH AND DEPENDING FROM SAID BODY PORTION, SAID FRONT AND REAR LEGS EXTENDING DOWN ALONGSIDE SAID FRONT AND REAR PORTIONS RESPECTIVELY OF SAID REINFORCEMENT MEMBER WITH SAID FRONT LEG BEING SUBSTANTIALLY LONGER THAN SAID REAR LEG, SAID LEGS HAVING SUBSTANTIALLY SMOOTH UNINTERRUPTED SURFACES CONFRONTING SAID FRONT AND REAR PORTIONS WITH SAID FRONT LEG HAVING A FIRST REARWARDLY-PROJECTING FLANGE FORMED AT ITS LOWER EDGE AND SAID REAR LEG HAVING A SECOND FORWARDLY PROJECTING FLANGE FORMED AT ITS LOWER EDGE, THE VERTICAL SPACING BETWEEN SAID FLANGES BEING SUBSTANTIALLY GREATER THAN THE MINIMUM SPACING BETWEEN SAID SECOND FLANGE AND THE RELATIVELY SMOOTH CONFRONTING SURFACE OF SAID FRONT LEG WHEN SAID INDEX TAB HOLDER IS DETACHED FROM SAID FOLDER, WHEREBY TO FACILITATE INSERTION OF SAID REINFORCEMENT MEMBER BETWEEN SAID LEGS, SAID LEGS MAKING A SNAP-FIT CONNECTION WITH SAID REINFORCEMENT MEMBER WITH SAID FIRST FLANGE UNDERLYING AND GRIPPING THE BOTTOM EDGE OF SAID FRONT PORTION OF SAID REINFORCEMENT MEMBER AND SAID SECOND FLANGE DISPOSED IN SAID GROOVE IN TIGHT FRICTIONAL ENGAGEMENT WITH SAID REAR PORTION.