I still have the mac client installed. It's not a native client, just the windows version inside a wrapper. In the next few days I'll see if I get it running
If you can get it to work in a similar manner as the Window's version (I.e. Drop the latest RoR launcher in the WAR directory and then run it) I'll add it to the client download topic
Sorry for the thread-necromancy, but I can confirm Return of Reckoning is somewhat working on Wine/Linux.
Atm got it to a point where it shows no graphical errors as far as I can tell.
Only Issue left for me is not beeing able to find the server.
Using Wine staging and .NET 4 via winetricks.