+xI don't think we have changed the Send by Email functionality. Perhaps your email client's functionality has changed.
You may be able to open the Save feature and type a .fpl extension on to the end of your route filename, which may force the format.
As an update for anyone viewing this topic, I have now installed ES file explorer which does the job. On Skydemon, I use the send by email option and that displays the option to use the ES app. The ES app lets me write directly to the inbuilt card reader/writer. Pop the card into the Garmin and import the file.