@kriswd40 a quick peek through the source turns up a possible offending exception here: https://github.com/MonoGame/MonoGame/blob/a9e5ae6befc40d7c86320ffdcfcd9d9b66f786a8/MonoGame.Framework/Platform/Media/Song.WMS.cs

This eventually leads here, which noted many types that aren’t strictly audio or video?
https://learn.microsoft.com/en-us/windows/win32/medfound/media-type-guids
Idk if any of that is in any way helpful, but I figured I’d share what I found before falling asleep.