In CefSchemeHandlerFactory::Create, if request->GetURL contains our custom "/embedded/" substring, then stream has path to local file and return new CefStreamResourceHandler(mime, stream);
All local resources work correctly, except sound files with extension 'wav', which stops working in CEF 75 and still doesn't work in CEF 81 and
in CefResourceRequestHandler::OnResourceLoadComplete, CefResourceRequestHandler::URLRequestStatus status == UR_FAILED.