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   Just for your reference

Int 21 Fn 71  - Dos 7 (chicago) - Long Filename Functions                  

   AH = 71h
   AL = function
       39h create directory
       3Ah remove directory
       3Bh set current directory
       41h delete file
       43h get file attributes (BL=00h), set file attributes (BL=01h)
       47h get current directory
       4Eh find first file
       4Fh find next file
       56h move (rename) file
       6Ch create/open file

Return: CF set on error
       AX = error code
       7100h if function not supported
   CF clear if successful
       other registers as for corresponding "old" DOS function

Notes: if error 7100h is returned, the old-style function should be called
   AX=714Eh returns a "search handle" which must be passed to AX=714Fh;
     when the search is complete, AH=72h must be called to terminate
     the search


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