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 var NewLied     : IWMPMedia;
     NewListe,
     AktListe    : IWMPPlaylist;
     PlayListen  : IWMPPlaylistArray;
     I           : Integer;

 if Opendialog1.execute then
 begin
 Paylisten:=Mediaplayer.playlistCollection.getByName('MeineMediaPlayerPlaylist');
   If Playlisten.count<>0 then
   begin
     for I:=0 to Playlisten.count-1 do
     begin
       AktListe:=Playlisten.Item(I);
       Mediaplayer.playlistCollection.remove(AktListe);
     end;
   end;

   NewListe:=Mediaplayer.playlistCollection.newPlaylist('MeineMediaPlayerPlaylist');

   NewLied:=Mediaplayer.newMedia(OpenDialog1.Filename);
   NewListe.appendItem(NewLied);
   MediaPLayer.currentPlaylist:=NewListe;
 end;					

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unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
  end;

var
  Form1: TForm1;
  wmp: variant;
  nmedia, PL: variant;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
  wmp := CreateOleObject('WMPlayer.OCX');
  PL := WMP.currentPlaylist;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  nmedia := wmp.newmedia('d:\02.mp3');
  PL.appenditem(nmedia);
  showmessage(inttostr(pl.count));      // wie erwartet: 1
  showmessage(nmedia.durationstring);   // und die länge des Tracks!
  wmp.controls.play;           // und es läuft ...!
end;

end.