[elmago00]

muchas gracias al fin lo conseguí, se demora un poco, pero no importa. muchas gracias Nelson
para que fuera compatible con XE3 lo hice asi.

Código Delphi [-]
procedure DumpFile(aFileName:TFileName; SG: TStringGrid; const BPF: Word);
var
  c, i, r, b : Integer;
  Ascii: String;
  Aux: Byte;
  Col : Integer;

begin

  with TMemoryStream.Create do
  try

    LoadFromFile(aFileName);



    // Configurar StringGrid

    SG.ShowHeader := False;
    SG.ShowHorzLines := False;
    SG.ShowVertLines := False;

    for i := 1 to BPF + 2 do
       SG.AddObject(TStringColumn.Create(nil));

    SG.RowCount:= Size div BPF;

    for Col := 0 to SG.ColumnCount - 1 do
    begin

        if (Col = 0) then
           SG.Columns[Col].Width := 80;

        if (Col <> SG.ColumnCount - 1) and (Col <> 0) then
           SG.Columns[Col].Width := 30;

        if (Col = SG.ColumnCount - 1) then
           SG.Columns[Col].Width := SG.Canvas.TextWidth('X') * BPF;

    end;

    SG.Cells[0,0]:= 'Offset(h)';
    SG.Cells[SG.ColumnCount-1,0]:= 'ASCII';

    for i:= 0 to BPF-1 do
    begin
      SG.Cells[i+1,0]:= IntToHex(i,2);
    end;

    // Cargar en StringGrid

    Seek(0, soBeginning);
    c:= 0;
    r:= 1;
    b := 0;

    while c < Size do
    begin

      Application.ProcessMessages;

      if CancelProcess then
      begin
         CancelProcess := False;
         Break;
      end;

      SG.Cells[0, r]:= Format('%s',[IntToHex(c, 8)]);
      Ascii:= EmptyStr;
      i:= 0;

      while (i < BPF) do
      begin
        Read(Aux, SizeOf(Byte));
        SG.Cells[i+1,r]:= IntToHex(Aux,2);
        if Aux = 0 then Aux := 46;
        Ascii:= Ascii + Chr(Aux);
        Inc(i);
        if (b < Size) then Inc(b);
      end;

      SG.Cells[SG.ColumnCount-1,r]:= Format('%s',[Ascii]);
      Inc(c, BPF);
      Inc(r);


    end;

  finally

    Free;

  end;

end;

// Salvar StringGrig a TXT
procedure SaveDump(aFileName:TFileName; SG: TStringGrid);
var
  c,r: Integer;
  s: String;
begin
  with TStringList.Create do
  try
    for r:= 0 to SG.RowCount-1 do
    begin
      s:= '';
      for c:= 0 to SG.ColumnCount-1 do s:= s + SG.Cells[c,r] + ' ';
      SetLength(s,Length(s)-1);
      Add(s);
    end;
    SaveToFile(aFileName);
  finally
    Free;
  end;
end;


{guardar}

procedure TForm12.Button25Click(Sender: TObject);
begin
 with SaveDialog1 do
  begin
    Filter:= '*.txt';
    DefaultExt:= '*.txt';
    if Execute then
      SaveDump(FileName, StringGrid1);
  end;
end;



{abrir}

procedure TForm12.Button6Click(Sender: TObject);
   var
   valor:string;
begin
    valor:='16';
 with OpenDialog1 do
  begin
    Filter:= '*.*';
    if Execute then
    begin
      Caption:= FileName;
      DumpFile(FileName, StringGrid1,
        StrToInt(valor));
    end;
  end;
end;

{cancelar}

procedure TForm12.Button26Click(Sender: TObject);
begin
CancelProcess := True;
end;

gracias a Ecfisa y Nelson.