I have been using CTWIN 9.73 without a problem. I updated to CTWIN 9.74 and 9.75 today. When I try to start the program , I get the following error message: unable to open C:CTY.DAT. The program then closes. I tried reloading the program, I tried downloading a different CTY.DAT file, which did not help. Any ideas? Thanks Jim, K2DE