Correct. I looked through the game xml-file but found nothing connecting to the file names.
Absolutely best would be if all files came in the right order. But then it would have to be something like
where 3 is the round and 4 is a constant that is just the number the country has in every turn. That is 1=Rus, 2=Ger etc.
Not so good looking but the files will be in perfect order.