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You can run aRO and a lot of other Windows programs on Linux using WINETake a look at this for some instructions: http://www.youtube.com/watch?v=Lb1fBabPw-sThat should get it running, but if you have an ATI video card it will probably be slow
It works moderately well on ATI/AMD video cards with the latest free radeon driver that comes with openSuse 11.4 (and probably other distros as well, but I only tested it on openSuse 11.4). You just have to do as told in the video, and additionally, check the "Able to catch mouse pointer in window" or however it's called, the first option that you can check on the "Graphics" tab in winecfg.The only thing I encountered, no idea if it's because of openSuse 11.4 or something else, is that I can't press "Return" to send a chat. The key works, but I'm unable to chat.