Online Documentation for Advanced Data Export for RAD Studio VCL
property AutoCalcStrType: boolean;
The AutoCalcStrType property works only if ExportSource = esListView or esStringGrid. If this property is true, then after exporting the first record of the source column Advanced Data Export tries to determine the data type of the column, and pass this type to the result file. E.g. if the first record value is '1234.78', and AutoCalcStrType = True, then all the column is treated as Float. It makes sense if all the values of the column have the same format, and you export data, e.g. to MS Excel.