In the DefaultConfig.xml file located under C:\Users\[user]\Documents\Visual Studio 2015\Settings you can change all sorts of settings for how Visual Studio works with Dynamics.

I needed to change something in this file on a local VM today. But the file kept being overwritten whenever I started Visual Studio again. So where did it originate from?

Google didn't have an answer. Ievgen Miroshnikov has though, but his article was just not very Google friendly along the terms of my query.

So I'm basically just able to repeat what Ievgen already has stated: The file originates from \AosService\PackagesLocalDirectory\Bin\DynamicsDevConfig.xml