Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Int 21h Function 13h
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  Interrupt:   21h     Function:   13h
 
  Title:       Delete File
 
  See also:    Delete File (handle)
 
  Description:
 
     Deletes all matching files from the current directory on the
     default or specified disk drive.
 
     Input                          Output
 
     AH = 13h                       If function successful (file or
     DS:DX = segment:offset of      files deleted)
             file control block       AL = 00h
 
                                    If function unsuccessful (no
                                    matching files were found, or
                                    at least one matching file was
                                    read-only)
                                       AL = FFh
                                    -♦-