Fran... You want to have a different icon show up for the file type .mat, right? In Windows Explorer, go to any folder with a .mat file in it. Right click on the file, then select properties. Near the top is an option that says "Opens with". You'll see the icon you don't like next to it. Click on the Change button. From there, select Bryce since you want to associate it with all the .mat files. If you don't see Bryce listed, you can browse for it. After picking Bryce, click Okay. Then, Apply, and Okay once again. Clear as mud? ~ Nevanna ~

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