We have found one software suitable in our database for this conversion.
Although both .fox to .fpt files come from ForPro/Visual FoxPro, it doesn't feel very likely that some kind of fox to fpt conversion is doable. This is mainly due the compiled natured of .fox files (executables), but also because of the different content of both these files.
If you need help with import/export of either of these files, it might be best to reach out to FoxPro community.
Updated: November 2, 2023
FOX
A fox file extension is related to the FoxPro a database management app. A fox file stores executable for FoxPro app.
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.