Are you sure about this? But I don't have the keyboard for the test, the owner is a cousin. And he is far from me. If you're sure that just changing the end of the extensions does it, I'll pass that on to him. But it doesn't seem very coherent to me. Reflect, please.
I am not 100% certain, no.
What I would do is to first copy the file, then change the file extension, then try the file with the new extension.
Doing that means your original file is safe from any risk of damage.
I think the worst that might happen is that the keyboard refuses to use the file.
I think the most likely result is that it will work just fine.