In AutoCAD Mechanical, there is a dimensional feature that can add ISO fit tolerances such as H7 or f6 and such. A user lost his list if fits and wanted to get them back. The problem was that his Mechanical VAL tables were lost (how, I do not know). To fix them, we copied a set from a working computer to "C:\Users\Public\Documents\AutoCAD Mechanical 2012\ACADM\GEN". We copied the VAL folder and all of its subfolders to get them restored.