[MPICH] fortran: CALL MPI_FILE_OPEN specifying file format

[Stephen Wornom]

I use fortarn. How does one specify that the file be written 
"formatted"? Is "unformatted" the default?
Thanks,
Stephen

      CALL MPI_FILE_OPEN( MPI_COMM_WORLD, filnam(1:ilength),
     1                    MPI_MODE_WRONLY + MPI_MODE_CREATE,
     2                    MPI_INFO_NULL, fh ,ierr)

The above writes the file solf.000000.data
the command
 file solf.000000.data
solf.000000.data: data

What is the relation between the "data" and say "unformatted?"