MacConverter is just what you need. Once you convert the files, you will have to put them in the right places manually many PC zip files will automatically go to their right folder, but that won't work for you. There is a utility (MacInstaller, also on MartinC's site) that does this, but I have not used it: being a bit of a control freak I like to place files myself. Most people include a ReadMe file that will tell you where everything goes in your Runtime folder. Cr2 files 'point to' an .obj file, which needs to be exactly where the Cr2 is expecting it to be; you may need to create a folder for it, and the readme will usually tell you where. If there isn't a readme, as can happen, or the file doesn't tell you, you can still find out by being clever: open the Cr2 in a text editor (bbedit lite is good for this, as it can open very very very long text files; get it free at http://www.barebones.com. Within the first few lines you'll see where the file is expecting to find its .obj. Oblige it by putting the converted .obj where it expects, and everything will be hunky dory. MartinC's documentation is very good, so do have a look at the manuals for MacConverter. Hope this helps!