✔ 最佳答案
You can follow the following procedures to change the default program:
1) Select a GIF file;
2) Right click the GIF and select "Open With";
3) Select "Choose Program";
4) A pop-up window that lists all applications will be popped up;
5) Choose "GIF Image";
6) Sleect "Always use the selected program to open this kind of file";
7) Click "OK".