Brandon:
Try this:
Open My Computer, click on Views from the Menu Bar and select Options. In the displayed dialog box, click on the File Types tab.
Use the down arrow key (or scroll bar) to go through the list until you find the extension you want to change.
Click on the Edit button and, in the new dialog box that opens, click on edit again. Use the browse button to find the appropriate application to use with that extension.
Let me know if that helps.
Larry De Laruelle
larry1de@yahoo.com