I looked at the modules loaded by the FlightSimulator.exe process on my system.
mdnsNSP.dll (Bonjour for Windows) is loaded. I also have iTunes for Windows installed which probably explains why it’s on my system, but why would MSFS load it ??
About Bonjour
The Bonjour for Windows package provides Bonjour zero-configuration networking services for use by Windows applications such as iTunes, Safari and AirPort Utility.
Bonjour enables computers and devices to automatically discover each other using industry standard IP protocols without the need to manually enter IP addresses or configure DNS servers. It is particularly useful for connecting to devices such as the iPhone, Apple TV, and AirPort base stations.
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In General Options, what sound devices are shown as being used?
This won’t likely be specific to anything in MSFS, but will be loaded into all processes on the system since you have it installed.
An mdns resolver like Bonjour provides network domain name resolution for “.local” addresses to computers on the local network advertising their names via local broadcast packets.
I presume that like similar systems on Linux it works by loading the library into all programs via some system hook so that when doing a lookup (eg to get 1.2.3.4 from “some-server.microsoft.com”) it knows how to look up “.local” addresses.
(This shouldn’t actually affect anything, as MSFS doesn’t let you input arbitrary URLs to download from, much less random computers on your network. 
)
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In my house anything Apple goes in the garbage disposal… i use JRiver Media Center
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Only the expected audio devices on my PC. Nothing Apple or network-related.
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I understand and appreciate that, but it’s not really the answer for me…
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Yeah, I think that might be it. I’ve been wondering why it seemed to pop up in many processes.
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I love this curiosity, good on you for digging around trying to understand what’s going on in your computer. And good response marked as a solution as well.