I had the same problem and did call the service support. There is no way you may downgrade the file. The only suggestion I got is to install different versions of solidworks . ( g" q1 b& P0 C( O' P ' r- R8 {1 Z$ u& gI had another probem. I am using solidworks 2007 english version. My colleague could not open in 2007 Chinese version. Do yo guys have the same probem?