This variable specifies the version number of new Vision data files that are created by AcuServer. The default value is "4", which produces Vision files in the latest format (Version 4). Version 4 files are generated in a dual file format, with data records stored in one segment and overhead key information stored 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.