FIL is the file type, e.g. "MS Access", "Excel 3.0", "Excel 4.0", and
various other possibilities.
It may seem strange that a file type can be "Excel 3.0" when the DSN says
"MS Access Databases", but that is because the ODBC driver for Excel/Text
files/some versions of xBASE and one or two other things are all based on
the Access "Jet" provider. In fact they all /are/ the Jet provider.
Internally, the Jet provider uses "IISAMs" (Installable ISAMs) for each type
of file.
As far as I know, "RedISAM" is an old keyword used to indicate aan
Access/Jet .mdb file type. It may still work with modern versions of ODBC
and the Jet provider, but if not, you may need to use "MS Access" instead.
Or you may be able to get away without the entire FIL=RedISAM keyword/value
pair altogether.
