Originally Posted by messyhead
This is the release thread for the last major release. It says it's now using Direct3D9. I'm not sure if that means it's using DirectX 9 or just some libraries. You'll know more than I.

https://SimHQ.com/forum/ubbthreads.php/topics/4234430/eech-ver1-16-0-is-out


EDIT: I just noticed thealx's reply above.

So, it seems it's using DX9 2007, which is the last one to include DirectPlay. The 2009 version didn't have that anymore, as it has been deprecated.
So, moving forward, I would be focusing on replacing the direct play based functionality, so that we can move on to more recent versions of the DX, or away from it completely.