[ecfisa]

Hola cardanver.

Otra propuesta:

Código Delphi [-]
procedure FormatTxtFile(const SourceName, TargetName: TFileName);
var
  ori,des,aux: TStrings;
  i,p : Integer;
  h,m : string;
begin
  ori:= TStringList.Create;
  des:= TstringList.Create;
  try
    ori.LoadFromFile(SourceName);
    for i:= 0 to ori.Count-1 do
    begin
      aux:= TStringList.Create;
      try
        ExtractStrings([' ',' '], [], PChar(ori[i]), aux);
        aux[0]:= StringOfChar('0', 3-Length(aux[0])) + aux[0];
        p:= Pos(':', aux[2]);
        h:= Copy(aux[2], 1, p-1);
        m:= Copy(aux[2], p+1, MaxInt);
        h:= StringOfChar('0', 2-Length(h)) + h;
        m:= StringOfChar('0', 2-Length(m)) + m;
        aux[2]:= h + ':' + m;
      finally
        des.Add(Format('%s %s %s',[aux[0],aux[1],aux[2]]));
        aux.Free;
      end;
    end;
    des.SaveToFile(TargetName);
  finally
    ori.Free;
    des.Free;
  end;
end;

Ejemplo de uso:

Código Delphi [-]
 
  FormatTxtFile('C:\Pruebas\Original.txt', 'C:\Pruebas\Nuevo.txt');

Saludos