How to modify the default open mode of file suffix in win7 system

Sometimes we download things online, you need to right-click and then select, open the way to find the way you want to open. If only once or twice, but if many times. This will be very annoying. At this time, if you double click, you can open this thing with the software you want.
1
First give an example to explain in detail:
In general, there are more than one video player in our computer, such as PPTV, PPS, popular, etc. are commonly used. But we open the downloaded video file and definitely don't want to open it with this. Because using these to open the network speed, it will take up a lot of memory. Personally, it is recommended to change the suffix of these files to play with the player that comes with Windows Media Player 12 system, so that it will not occupy the network speed. Let's talk about the setting method
2
Click to start, click "“Default Program" in the menu bar.
Then press the picture below to set it up.

3
Click OK, it will pop up the window that allows you to select those suffixes to open with this software, as shown in the figure

The above is about the default opening method of how to modify the file suffix of win7 system. The above picture is in accordance with the way the set video file is opened, if you are other suffixes remember to combine your own actual situation.