delete a string of data in a file

How do you delete a string of data if you know what the string should contain?. ex. I want to delete the line lastdrive=w from my autoexec.bat.
I use Delphi 3.
hhAsked:
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interConnect With a Mentor Commented:
Use the following funcion

// call example : RemoveFromFile('c:\Autoexec.bat','lastdrive=w')
// this procedure deletes every occurring line of Substr
// so be carefull and modify the program accordingly

function RemoveFromFile(FileName, SubStr : string):boolean;
var
  S : TStringlist;
  i : integer;
begin
  S := TStringList.Create;
  try
    S.LoadFromFile(FileName); // load file
    for i:= S.Count-1 downto 0 do
      if Pos(UpperCase(SubStr), UpperCase(S[i])) then
        S.Delete(i);
    S.SaveToFile(FileName); // override file
  finally
    S.Free;
  end;
end;

May it works,
Igor
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