[marcoszorrilla]

He preparado este ejemplo, que puede servir como base, como es tarde lo dejo así, solo queda darle algunos retoques:

Se necesita:
Un TOpenDialog y un StringGrid

Código Delphi [-]
unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, Grids;

type
  TForm1 = class(TForm)
    Button1: TButton;
    OpenDialog1: TOpenDialog;
    StringGrid1: TStringGrid;

    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}



procedure TForm1.Button1Click(Sender: TObject);
var
  iFileHandle: Integer;
  iFileLength: Integer;
  iBytesRead: Integer;
  Buffer: PChar;
  i: Integer;
  j: Integer;
  begin
  if OpenDialog1.Execute then
  begin
    try
      iFileHandle := FileOpen(OpenDialog1.FileName, fmOpenRead);
      iFileLength := FileSeek(iFileHandle,0,2);
      FileSeek(iFileHandle,0,0);
      Buffer := PChar(AllocMem(iFileLength + 1));
      iBytesRead := FileRead(iFileHandle, Buffer^, iFileLength);

      FileClose(iFileHandle);
      for i := 0 to iBytesRead-1 do
      begin
      StringGrid1.RowCount := StringGrid1.RowCount + 1;

        StringGrid1.Cells[1,i+1] := Buffer[i];
        StringGrid1.Cells[2,i+1] := IntToHex(integer(Buffer[i]),2);
      end;
    finally
      FreeMem(Buffer);
    end;
  end;

end;

end.

Un Saludo