Click "Open With" (if open with is not there hold down the Shift Key and right click again) and click "choose default program"
Locate the program you want to use to open the file (click the little down arrow to right of the dialogue windows to see more programs or use the browse button)
Make sure the check box that says "Always use the selected program to open this kind of file" is ticked and then click the OK button
Click "Open With" (if open with is not there hold down the Shift Key and right click again) and click "choose default program"
Locate the program you want to use to open the file (click the little down arrow to right of the dialogue windows to see more programs or use the browse button)
Make sure the check box that says "Always use the selected program to open this kind of file" is ticked and then click the OK button