Convert FP5 to XLSX

The only reliable way to work with and possibly export old .fp5 databases and save them as Excel spreadsheets (fp5 to xlsx conversion) would be to use the very software they were created in - FileMaker Pro. Unfortunately, it seems the support for older FileMaker format is pretty limited, so this may not only be your best, but also possibly the only way to convert .fp5 databases to Excel spreadsheet format.