I have both a Mac and PC at work. I've said that before. I've never had a problem with file reassociation in Mac. I always get the prompt asking me if I want to remember to open a certain type of file with a specific program, but the file icons never change. The only time an image file icon changes is if I've worked on it in Photoshop. Then the icon changes to reflect what the actual image is. Kinda nice. Small, but nice.