I guess you don't have that module that reads in native MCAD files. Most CAE applications these days have the ability to read in native files from all the major MCAD packages. For example, MasterCAM X will read in native MCAD files for use within that application. They do not allow feature modification unless it's fully integrated.
So with that said, check your ANSYS software revision and maintainence contract.
Best Regards,
Heckler
Sr. Mechanical Engineer
SW2005 SP 5.0 & Pro/E 2001
Dell Precision 370
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Never argue with an idiot. They'll bring you down to their level and beat you with experience every time.