To Play a .Wav File

Hi,

I wanted to play a.wav file. This is what i have done

DWORD WINAPI PlayRing(LPVOID lpParam)
{
    CString strFileToPlay;
    strFileToPlay = "Pulse.wav";
    BOOL bRet;
    bRet = PlaySound(strFileToPlay,NULL,SND_FILENAME|SND_LOOP);
    return 0;

}
BOOL CDialogIncomingCall::OnInitDialog(void)
{
    CDialog::OnInitDialog();

    //play the ring tone thread here and stop it when reject is pressed

    HANDLE hThread;
    DWORD dwThrdParam = 1;

    hThread = CreateThread(NULL, // default
security attributes
                0, // use default stack size
                PlayRing, // thread function
                &dwThrdParam, // argument to thread function
                0, // use default creation flags
                &dwThreadId); // returns the thread identifier

    return 0;
}

But the .wav file is not getting played.

I think this .wav file has to be loaded into the workspace.
 i don't know how to do that. Can anyone one tell me the
solution......

Lucky