get current process name with file extension in c#

string filename; Process[] procs = Process.GetProcesses() ; foreach (Process prc in procs) {

            if (procs.Length > 0)
            {
                int id = prc.Id;
                IEnumerator<filesysteminfo> fie = DetectOpenFiles.GetOpenFilesEnumerator(id);

                while (fie.MoveNext())
                {
                    if (fie.Current.Extension.ToLower(CultureInfo.InvariantCulture) == ".mp3")
                    {
                        filename = fie.Current.FullName;
                        break; // TODO: might not be correct. Was : Exit While
                    }
                }
            }
        }