How to change the associated program of the file in Windows Vista?
Some files may not open properly if the associated program of the file is set to a different application
1. Click Start
2. Select Control Panel
3. Select Classic View
4. Double-click Default Programs
5. Click Associate a file type or protocol with a program
2. Select Control Panel
3. Select Classic View
4. Double-click Default Programs

5. Click Associate a file type or protocol with a program

6. Locate the file type. To know the type of the file, Right-click on the file -> Select Properties
7. Select the file type
8. Click the Change Program Button

9. Select the Application

10. Click OK