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  Function 43H (decimal 67) gets or sets the attributes of a file. (See page
  113 for details about file attributes.) DS:DX points to an ASCIIZ string
  that specifies the file in question. (Global filename characters ? and *
  cannot be used.) Calling function 43H with AL = 00H returns the file's
  attributes in CX; AL = 01H sets the attribute values you specify in CX.

  If function 43H fails, the carry flag is set and AX contains one of four
  error codes: 01H (invalid function), 02H (file not found), 03H (path not
  found), and 05H (access denied).