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                   XFCB - Extended DOS File Control Block

      Offset Size             Description

        00   byte   flag containing FF if this is an extended FCB
        01  5bytes  reserved
        06   byte   directory attribute byte    (see FILE ATTRIBUTE)
        07   byte   drive number (0 for default drive, 1 = A:, 2 = B:)
        08  8bytes  filename, left justified with trailing blanks
        16  3bytes  filename extension, left justified w/blanks
        19   word   current block number relative to file start (0 based)
        21   word   logical record size in bytes
        23   dword  file size in bytes
        27   word   date the file was created or last updated:

                |F|E|D|C|B|A|9|8|7|6|5|4|3|2|1|0| 21,20
                 | | | | | | | | | | | +--------- day 1-31
                 | | | | | | | +---------------- month 1-12
                 +----------------------------- year + 1980

        29 16bytes  reserved for system use
        39   byte   relative record number within current BLOCK
        40  4bytes  relative record number from start of file (0 based)