Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Int 21h Function 17h
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  Interrupt:   21h     Function:   17h
 
  Title:       Rename File
 
  See also:    Rename File (handle)
 
  Description:
 
     Alters the name of all matching files in the current directory on
     the disk in the specified drive.
 
     Input                         Output
 
     AH = 17h                      If function successful (one or more
     DS:DX = segment:offset of     files renamed)
             special file            AL = 00h
             control block
                                   If function unsuccessful (no
                                   matching files or new filename
                                   matched an existing file)
                                     AL = FFh
                                    -♦-