Converting the format of CAD files

Hi,

  i was using creo wildfire 5.0 before, but now i shifted to creo 2.0 student version. The files which is created using the older version is not opening in the current version which i am using now. Recently i have downloaded few cad files from SKF ( a bearings and housing manufacturer ), even those files are not opening in my current version, since the manufacturer used a commercial version of creo. could someone please help me in converting the format of this CAD files.

Thank you