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unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, int3onfiledrop, StdCtrls;

type
  TForm1 = class(TForm)
    Memo1: TMemo;
    procedure FormCreate(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
    procedure OFD(filename:string);
  private
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
  end;

var
  Form1: TForm1;
  drop : TonfileDrop;

implementation

{$R *.dfm}

procedure TForm1.OFD(filename:string);
begin
   memo1.lines.add(filename);
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  drop := tonfiledrop.Create(Memo1);
  drop.OnFileDrop := OFD;
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
  drop.free;
end;

end.					

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procedure TForm1.OnFileDrop1FileDrop(filename: String);
begin
  memo1.Lines.Add(filename);
end;					

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// im interface -teil
function PathMatchSpecA(pszFile, pszSpec: PAnsiChar): Boolean; stdcall; external 'shlwapi.dll';
// ...

procedure TForm1.OnFileDrop1FileDrop(filename:string); 
begin 
   if pathmatchspecA(pchar(filename), '*.mp3') then memo1.lines.add(filename); 
end;					

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procedure TForm1.OnFileDrop1FileDrop(filename:string); 
begin 
   memo1.lines.add(extractfilename(filename)); 
end;					

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POnFileDrop = ^TOnFileDrop;