Int 21 Fn 23  - Dos 1+ - Get File Size For Fcb                             [D]

   AH = 23h
   DS:DX -> unopened FCB (see #1034), wildcards not allowed

Return: AL = status
       00h successful (matching file found)
       FCB random record field filled with size in records, rounded up
       to next full record
       FFh failed (no matching file found)

Notes: not supported by MS Windows 3.0 DOSX.EXE DOS extender
   MS-DOS returns nonsense if the FCB record number field is set to a very
     large positive number, and status FFh if negative; DR DOS returns the
     correct file size in both cases
BUG:   APPEND for DOS 3.3+ corrupts DX if the file is not found

See Also: AH=42h