I have just downloaded the latest (test) version of Codeweavers Crossover for the Mac, downloaded the AChat installer and then created a “Bottle” within Crossover. Since there is no pre-made setup, Crossover is guessing what config to pick and it propsed a Win7 bottle to install AChat into. Ran the installer without any additional changes. Ran through smoothly and now just plain works, hires, sound and all. Since Codeweavers also offers a Crossover version for Linux, AChat on Linux might be an easy thing as well.