For example, you write programs such as the MP3 file created after installation, it will replace the *. mp3 file of windows or other applications to replace your MP3 icon by default and every people click on the file *. mp3 is how and when you read this article also MP3 wma it will be more readable and *. mp3 and *. wma and will in turn replace the icon mp3, wma in windows and wma to mp3 icon and various ... In short, make your program into default when people click on the file that it supports ..
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Vietnamese translation into English by Google Translate because I am from Vietnam.