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 . 7 F4 P' f0 G; [! ^, ]$ Q( r / s; H$ f# Z, }I 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?