We have found one software suitable in our database for this conversion.
fpt to dbx conversion seems to be related to export between two database formats, most likely from Visual FoxPro. As such, your best and perhaps also only way how to do this, would be to use Visual FoxPro itself or similar software that supports Visual FoxPro formats.
Updated: May 3, 2023
FPT
An fpt file extension is used for database memo files. An fpt memo file is special RAW text file that contains text "notes" about main database tables. FPT database memo format is used by variety xbase applications such as Visual FoxPro, FileMaker Pro, dBase, etc.
DBX
A dbx file extension is related to the Microsoft Visual FoxPro tables.