How to change file associations on Lenovo notebooks is as follows:

1. Right-click the file whose extension association you want to change, and then click Open With.

　2. In the Open With dialog box, click the program in which you want to open the file, or click Browse to find the program you want.

3. Select the "Always use the selected program to open this kind of file" check box.

Lenovo notebook refers to the portable laptop computer produced by Lenovo Group. Lenovo Group was founded in 1984 by the Institute of Computing Technology of the Chinese Academy of Sciences with an investment of 200,000 yuan and 11 scientific and technical personnel. Today, it has developed into a large enterprise group with diversified development in the information industry. Lenovo is headquartered in Raleigh (Purchase), USA, and has established a global R&D structure with three R&D bases in Beijing, China, Tokyo, Japan, and Raleigh, USA. Through Lenovo's own sales organization, Lenovo business partners and the alliance with IBM, the new Lenovo sales network spans the world.