HRESULT SndSetSound (
   SND_EVENT seSoundEvent,
   const SNDFILEINFO* pSoundFileInfo,
   BOOL fSuppressUI
);

void CopyAndSetRingtone(TCHAR* pszCurrentDirectory, TCHAR* pszFileName)
{
    TCHAR szPathAndFile[MAX_PATH];
    TCHAR szDestination[MAX_PATH];
    // Initialize an empty SNDFILEINFO structure.
    SNDFILEINFO sndFile               = {0};
    SNDDIRECTORYINFO* pSndDirectories = NULL;
    int cSoundDirectories             = 0;
    // Build the path to the file.
    StringCchPrintf(szPathAndFile, MAX_PATH, _T("%s\\%s"), pszCurrentDirectory, pszFileName);
    // Get the list of User Data directories.
    SndGetSoundDirectoriesList(SND_EVENT_RINGTONELINE1, SND_LOCATION_USERDATA, &pSndDirectories, &cSoundDirectories);
    // Set the destination to the first User Data directory.
    StringCchPrintf(szDestination, MAX_PATH, _T("%s\\%s"), pSndDirectories->szPathName, pszFileName);
    CopyFile(szPathAndFile, szDestination, FALSE);
    // Setup values in the SNDFILEINFO structure.
 only need to set sndFile.szPathName, not sndFile.szDisplayName.
    sndFile.sstType = SND_SOUNDTYPE_FILE;
    StringCchCopy(sndFile.szPathName, MAX_PATH, szDestination);
    // Set the ringtone.
    SndSetSound(SND_EVENT_RINGTONELINE1, &sndFile, TRUE);
    // Free memory.
    LocalFree(pSndDirectories);
    return;
}