I Can not open solidworks drawings of grabcad in solidworks 2013 in my pc.when i open drawing in my pc it is shows error like this drawing is not open,please contact for technical support.please answer what i can do?
The most likely reason is that the model was saved in a "future version". You'll need to use another file format like step or parasolid.
The other likely reason, is your copy of solidworks is an educational license, and the files you seek to open are from a commercial/full license. Again, you'll need another file type.
What model are you trying to open? I'm sure someone here could convert it for you.