#gCAD3D saved me many times, is a small application that open #DXFs the older versions, but save files into #IGES or #STEP and permit me to works with plans of others, sometime is hard to opens file from other but in somewhat this small application heal those messy #CADs, it is only 1.7mb, it opens also STEP or IGES but isn't always the best way, but many times is the only way.