Datafiles must be converted to Omnis 7.3 before they are used with Omnis Studio.
A datafile that was previously used with a version of Omnis prior to Omnis 7.2 may still contain some "Old Type Data." You must use the Check Datafile Utility in Omnis 7.3 to determine if any slots in your datafile contain old type data, and if so convert them to the Omnis 7.3 format. Additionally if any slot requires reorganizing then it is recommended that this be done before converting the datafile to Omnis Studio.
Also use the Omnis 7.3 Examine Datafile Utility to determine the number of records in each slot. Delete any slots that contain zero records because these may cause problems with the conversion of the data.
Once your datafile has no Old Type Data and no empty slots then it is ready for conversion to Omnis Studio.