Int 21 Fn 4305  U - Dr Dos 5.0-6.0 Internal - Set Extended File Attribute  [O]

   AX = 4305h
   DS:DX -> ASCIZ filename
   ???

Return: CF clear if successful
   CF set on error
       AX = error code (see #1366 at AH=59h/BX=0000h)
Desc:  this function allows the extended attributes, and optionally the
     encrypted password, of a file to be set.

Note:  this function is only supported by DR DOS 5.0 and 6.0 and DRMDOS 5.1

See Also: AX=4304h,AX=4311h