Thanks for letting me know about MC11.exe. Seems like the commands page should be edited to let people know about the change. It would also be helpful to note that MC11.exe is stuck in the \windows\system32 folder.
My assumption was that we could use the commands as structured in the link from message 2, but I'm finding that not to be the case. When I make a Main Lobby button with MC11.exe alone, no parameters, it opens Media Center according to the startup options specified in MC11. If I include ANY parameters, e.g. /Play, nothing happens. Has something happened in addition to the switch to MC11.exe, such as syntax changes? It seems extremely odd that a command line with any parameter- even a single forward slash- does nothing as opposed to ignoring the parameter and at least opening MC11.
Granted, I'm not a programmer, but it seems I should be able to do a simple thing like getting MC11 to play a playlist from a button. If I understand the command syntax as presented, I should be able to use MC11.exe /PlayReplace TREEPATH=Playlists\{name of playlist}. Can someone see what I'm doing wrong or not understanding? Thanks.