Strange File Not Found errors with mmioOpen

//"Counting.wav" does not work
Sounds.append(Audio.Sound(L"c:/test/xaudio2/Counting.wav"))
Sounds.append(Audio.Sound(L"Electro_1.wav"))
//"heli.wav" does not work
Sounds.append(Audio.Sound(L"c:/test/xaudio2/heli.wav"))
//"HipHoppy_1.wav" does not work
//"c:/test/xaudio2/HipHoppy_1.wav" does not work
Sounds.append(Audio.Sound(L"1.wav"))
Sounds.append(Audio.Sound(L"MusicMono.wav"))
Sounds.append(Audio.Sound(L"MusicSurround.wav"))
//"Techno_1.wav" does not work
//"c:/test/xaudio2/Techno_1.wav" does not work
Sounds.append(Audio.Sound(L"2.wav"))

MMIOINFO info;
ZeroMemory(&info, sizeof(MMIOINFO));
m_hmmio = mmioOpen( strFileName, &info, MMIO_ALLOCBUF | MMIO_READ );
if(!h_hmmio)
    std::wcout << L"Error Code: " << info.wErrorRet << L"n";