HRESULT XPackageEnumerateChunkAvailability(  
         const char* packageIdentifier,  
         XPackageChunkSelectorType type,  
         void* context,  
         XPackageChunkAvailabilityCallback* callback  
)  

HRESULT GetPackageLanguages(_Out_ std::map<std::string, bool>& languages)
{
    char id[XPACKAGE_IDENTIFIER_MAX_LENGTH];

    HRESULT hr = XPackageGetCurrentProcessPackageIdentifier(_countof(id), id);
    if (FAILED(hr)) return hr;

    hr = XPackageEnumerateChunkAvailability(id,
        XPackageChunkSelectorType::Language, &languages,
        [](void* context, const XPackageChunkSelector* sel, XPackageChunkAvailability av)
    {
        auto languages = static_cast<std::map<std::string, bool>*>(context);
        switch (av)
        {
        case XPackageChunkAvailability::Ready:
        case XPackageChunkAvailability::Pending:
            languages->emplace(sel->language, true);
            break;

        case XPackageChunkAvailability::Installable:
            languages->emplace(sel->language, false);
            break;

        case XPackageChunkAvailability::Unavailable:
        default:
            break;
        }
        return true;
    });

    return hr;
}