do we have any API or any other delievered functionality which could read the MIME type of the file

If few files being upload into the peoplesoft system are to be blocked or allowed we do it based on the file extn.Is it possible blocking the files on the basis of

there content type or the MIMe values.There is PS delieved table PTFILE_MIMEMAP to read the MIME types based on the extn of the file .However in case as the file to be

uploaded is renamed the extn of the file would also change and so would the MIME type picked from the PTFILE_MIMEMAP table .which would not suffice our needs.