When you’re a government you can mandate the file formats (and versions thereof) you are willing to accept.
How do you think currencies are established? By accepting chickens and cows in lieu of legal tender? That’s precisely the meaning of legal tender. This is the exact analogue thereof: information is required as value is required, information and value are required in a mandated standardised form, other forms are rejected a priori.
Sure, the government could force a format change if they really want to.