I'm not sure about the icon problem but I was using an imac and a pc for 'trading' for a long time. Other apps you should look for (in trading): Easy WMA (yes some idiots rip into wma then post torrents of it) and Switch. Is it okay to say that a certain titanium version is openly available on a different 'trading' site?
In fact, 75% of my useful apps were freeware or traded....
See, other than my technobabble issue (posted prev), things are much easier in mac land. I'm guessing you were intially unfamiliar with disk images and how they mount/dismount etc....I was when I first got os x. I traded up recently all the way to mac os 10.4.4 Yehaw!!