thank you, James.
I have downloaded PADSviewer and opend the PCB file!
I tried to reply you in the EngineerZone. But first time it said EninnerZone was under maitaining. After that, I found the "reply" button was no use when I clicked on it 
So I have to send your an thanks message by email.
BTW, I used IE Explorer 10, and EngineerZone is in chinese language.
Liu Shiming
2013.9.10