Opening solid parts in Master Cam

Hello everyone.   I am running Solid Works 2011.   Why can"t I open the solid parts directly while in Master Cam?   I used to be able to and now it says " can not find parasolid data in SolidWorks file.   I am still running MasterCam X4.  Too busy to load 5  I hope that is not the issue.

    Thanks in advance.

SolidworksImport export