Hi, as far as I know the X3 does not support SW 2010 files (the swedish mastercam support team told me so). I have not yet tried to open SW 2010 files in X4 but that should work. In the mean time I export the files to parasolid x_t from SolidWorks and in the export window I click the options button and select parasolid version 16, works great for me. (I cannot start using X4 yet because I'm waiting for one of my postprocessors to be fixed). Hope this will help you..