If you are going from Virtual Gibbs on the Mac to the PC you will need to have version 5.1 installed on both systems. You will need to open and save each file on the Mac version of Gibbs. Then, copy all the files to your PC and open and save them in version 5.1on the PC. They will then be updated to the PC and will open in any newer version of Gibbs. If you have the 5.1 CD for your Mac the same CD also contains the PC version of Gibbs. If you have the original Gibbs System you can only transfer the geometry. To do this you must open the ncCAD file in Virtual Gibbs 5.1 on the Mac then follow the procedure outlined above.