Easiest way to bring the libraries into an older version of PADS is again through ASCII file
Once you import the ASCII file into PADS2005, save it as a different copy, remove all the traces and Rat Nets. And save all components into a single library file. That will automatically create the decal library and padstack..
BTW, can you share the PCB file here ? if that does not violate your company & client confidentiality and that fits within the size restriction of EDA Board. I can give a try to convert that ASCII file..