This specifies the version number of new Vision files that are created. The default value is "4", which produces current Vision files (Version 4). Version 4 files are generated in a dual file format, with data records filed in one segment and overhead key information filed in another. The value "3" produces Version 3 files, in which data and keys are stored in a single file. The value "2" produces Version 2 files. Any value other than "2" or "3" produces Version 4 files.