procedure TForm1.Button1Click(Sender: TObject);
var
filenm,path:string;
begin
if self.OpenDialog1.Execute then
begin
filenm:=extractfilename(self.OpenDialog1.filename);
path:=extractfiledir(self.OpenDialog1.filename);
self.Table1.Active:=false;
self.Table1.databasename:=path;
self.Table1.tablename:=filenm ;
self.Table1.Active:=true;
end;
end;

unit Unit1;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Vcl.Grids, Vcl.DBGrids,
  Data.DB, Bde.DBTables;

type
  TForm1 = class(TForm)
    Table1: TTable;
    DataSource1: TDataSource;
    DBGrid1: TDBGrid;
    Button1: TButton;
    OpenDialog1: TOpenDialog;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
filenm,path:string;
begin
if self.OpenDialog1.Execute then
begin
filenm:=extractfilename(self.OpenDialog1.filename);
path:=extractfiledir(self.OpenDialog1.filename);
self.Table1.Active:=false;
self.Table1.databasename:=path;
self.Table1.tablename:=filenm ;
self.Table1.Active:=true;
end;
end;

end.