The CONV$PASS_FILES routine specifies a file to be converted
    using the CONV$CONVERT routine. A single call to CONV$PASS_FILES
    allows you to specify an input file, an output file, an FDL file,
    and an exception file. If you have multiple input files, you must
    call CONV$PASS_FILES once for each file. You need to specify only
    the input_filespec argument for the additional files, as follows:

    status = CONV$PASS_FILES (input_filespec)

    The additional calls must immediately follow the original call
    that specified the output file specification.

    Wildcard characters are not allowed in the file specifications
    passed to the CONVERT routines.