Оформил: DeeCo
Автор: http://www.swissdelphicenter.ch

uses
   Inifiles, ShellApi;

 procedure TForm1.Button1Click(Sender: TObject);
 var
   Ini: TInifile;
   ScreenSaverFile: string;

      function GetLongFileName(const FileName: string): string;
   var
     aInfo: TSHFileInfo;
   begin
     if SHGetFileInfo(PChar(FileName), 0, aInfo, SizeOf(aInfo), SHGFI_DISPLAYNAME) <> 0 then
       Result := string(aInfo.szDisplayName)
     else
       Result := FileName;
   end;

      begin
   Ini := TInifile.Create('system.ini');
   ScreenSaverFile := GetLongFileName(Ini.Readstring('boot', 'SCRNSAVE.EXE', 'Not Available'));
   Ini.Free;
   label1.Caption := ScreenSaverFile;
 end;