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  Description:  Get or Set File Attributes
 
  Obtains or alters the attributes of a file (read-only, hidden, system, or
  archive).
 
  Input                                         Output
  ══════════════════════════════════            ══════════════════════════
  AH=43H                                        If function successful
  AL=00H if getting file attribute              Carry flag=clear
     01H if setting file attribute              CX=file attribute (see
  CX=new file attribute, if AL = 01H                above)
      (bits can be combined)                    If function unsuccessful
     bit 5=archive                              Carry flag=set
     bit 2=system                               AX=error code
     bit 1=hidden
     bit 0=read-only
  DS:DX=segment:offset of ASCIIZ
         pathname
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