Registry location for storing data

I'm creating a new release (version 5) of an application whose registry contents won't be compatible with earlier releases, so I changed my code to write everything under:

HKCU\Software\DeepSkyStacker\DeepSkyStacker5

and that is working just fine.

However there's a custom control that I use that us storing all its stuff using:

AfxGetApp()->WriteProfileBinary(_T("PictureList"), _T("Settings") ...);

and that stuff ends up here:

HKCU\Software\DeepSkyStacker\DeepSkyStacker\PictureList\Settings

However I want it to be written to:

HKCU\Software\DeepSkyStacker\DeepSkyStacker5\PictureList\Settings

Does anyone know the necessary incantation to achieve this please?

Solution found!

Code:

    //
    // Set our Profile Name to DeepSkyStacker5 so native Windows registry stuff will be written under "DeepSkyStacker\\DeepSkyStacker5"
    // 
    // First free the string allocated by MFC at CWinApp startup.
    // The string is allocated before InitInstance is called.
    free((void*)m_pszProfileName);
    // Change the name of the registry profile to use.
    // The CWinApp destructor will free the memory.
    m_pszProfileName = _tcsdup(_T("DeepSkyStacker5"));

Thanks
David

Changing registry key used by Windows code (not mine) to store stuff.All my registry (QSettings) work for the new version is being written to HKCU/Software/DeepSkyStacker/DeepSkyStacker5Something is stubbornly writing toHKCU/Software/DeepSkyStacker/DeepSkyStackerWhat to I have to change in CWinApp to make it use the other section???