We are using CefSchemeHandlerFactory and if request->GetURL contains our custom /embedded/ 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 because
CefResourceRequestHandler ::OnResourceLoadComplete, CefResourceRequestHandler::URLRequestStatus status == UR_FAILED.