As far as I know, conversion is not possible. You can export the data from FileMaker and import it into Access, the user interface, scripts, relationships will not import, you'll have to recreate them in Access.
Excel, Tab and CSV are all file formats you can use for this export/import.
An ODBC import of the data from FMP to MS Access may well be possible as well.
After that it becomes an Access problem and probably not a good question to ask in a FileMaker forum...