Depends on the place. This sort of interoperability is explicitly allowed in the EU.

Per whose interpretation of the law? The DMA isn’t going to give nerds the utopia they think that they’re going to get.

Note: I am not a lawyer, this is not legal advice.

In the EU, reverse engineering is allowed by law if the reason for doing so is interoperability by the one who owns a license to the product in question.

"The authorisation of the rightholder shall not be required where reproduction of the code and translation of its form within the meaning of points (a) and (b) of Article 4(1) are indispensable to obtain the information necessary to achieve the interoperability of an independently created computer program with other programs, provided that the following conditions are met:

(a) those acts are performed by the licensee or by another person having a right to use a copy of a program, or on their behalf by a person authorised to do so;

(b) the information necessary to achieve interoperability has not previously been readily available to the persons referred to in point (a); and

(c) those acts are confined to the parts of the original program which are necessary in order to achieve interoperability."

More information: https://www.vidstromlabs.com/blog/the-legal-boundaries-of-re...

Luckily Nintendo (Shadowrun is still some years away, when Ninsonmicro determines what is legal and what isn't) is not the authority to determine if something is illegal or not. But of course they are entitled to their own opinion.