To answer your question, I
think so. I'm not
sure about one piece of your question: using it to play media files attached to the receiver itself.
Generally, MC works quite well with DLNA devices. It can serve its own Library as a DLNA Server, so you can browse and use the entire Library from your Pioneer. And, it can remote control the receiver easily. MC will auto-create a zone for the receiver when it sees it on the network, and you can play any file in MC's Library to it. It can even be set up as a DLNA Renderer itself, so that you could control it and play music (on your PC) from a separate DLNA controller.
I'm
pretty sure MC can connect and browse the library of a DLNA Server on your network as well. I know it could, as it is explicitly mentioned in the
Wiki DLNA article. But that stuff is pretty old, and I think the way you access them has possibly changed. Perhaps someone else can comment and describe the exact steps. I have a receiver I can play to from MC (and that works) but it doesn't have any media attached to it, and I haven't ever turned on its server or anything.
If you haven't, you can download the trial and try it. They have a full-featured 30 day trial and JRiver strongly recommends that you use it and try anything that is essential to you before you buy it.
Check under
Playing Now in the
Tree, and under
Tools > Options > Media Network.